METALLOCENES AND CATALYST COMPOSITIONS DERIVED THEREFROM

Abstract: Metallocenes and catalyst systems for olefin polymerization derived therefrom. The metallocenes may be represented by the formula: (I), wherein M<1> preferably is zirconium or hafnium; and R<5> is different from hydrogen.

Description: TITLE: METALLOCENES AND CATALYST COMPOSITIONS DERIVED THEREFROM Inventors: T. J. Burkhardt, J. R. Hart, W. T. Hay good, R. T. Li FIELD This invention relates to metallocene compounds and their use in the preparation of catalyst compositions for olefin polymerization, particularly propylene homo- and copolymerization. The present invention also relates to polymerization processes using such catalyst compositions and polymer compositions obtainable by these processes. BACKGROUND The use of metallocene compositions in olefin polymerization is well known. Metallocenes containing substituted, bridged indenyl derivatives are noted for their ability to produce isotactic propylene polymers having high isotacticity and narrow molecular weight distribution. Considerable effort has been made toward obtaining metallocene produced propylene polymers having ever-higher molecular weight and melting point and, thus, ever better strength (impact) properties, while maintaining suitable catalyst activity. Toward this end researchers have found that there is a direct relationship between the way in which a metallocene is substituted and the molecular structure of the resulting polymer. For the substituted, bridged indenyl type metallocenes, it is now well established that the type and arrangement of substituents on the indenyl groups, as well as the type of bridge connecting the indenyl groups, determines such polymer attributes as molecular weight and melting point. For example, U. S. Patent Nos. 5,840,644 and 5,770,753, incorporated herein by reference in their entireties, describe certain metallocenes containing aryl-substituted indenyl derivatives as ligands, which are said to provide propylene polymers having high isotacticity, narrow molecular weight distribution and very high molecular weight. Likewise, U. S. Patent No. 5,936,053, incorporated herein by reference in its entirety, describes certain metallocene compounds said to be useful for producing high molecular weight propylene polymers. These metallocenes have a specific hydrocarbon substituent at the 2 position and an unsubstituted aryl substituent at the 4 position on each indenyl group of the metallocene compound. WO 98/40419 and WO 99/42497 both describe certain supported catalyst systems for producing propylene polymers having high melting point. Metallocene compositions and their activators are often combined with a support material in order to obtain a catalyst system that is less likely to cause reactor fouling. However, it is known that supported metallocene catalyst systems tend to result in a polymer having lower melting point than would otherwise be obtained if the metallocenes were not supported. Much of the current research in this area has been directed toward using metallocene catalyst systems under commercially relevant process conditions, to obtain propylene polymers having melting points higher than known metallocene catalyst systems and close to, or as high as, propylene polymers obtained using conventional, Ziegler-Natta catalyst systems. The present inventors have discovered metallocene compounds that not only have this capability, but retain it upon supportation. Additionally, it would be desirable to have available metallocenes which not only afford propylene homopolymers having high melting points of (i.e., high stereotacticity), but also elastomeric copolymers having the high molecular weights required for the production of, e.g., impact copolymers, thereby making possible the production of satisfactory in situ blends of, e.g., propylene homopolymer and ethylene-propylene rubbers (EPR's) with a single catalyst composition in a single reactor or in a series of two or more reactors. The present inventors have found metallocene compounds which in combination with a cocatalyst (activator) make both propylene homopolymers having high melting points and elastomeric copolymers that are suitable for the production of impact copolymers in combination with these propylene homopolymers. SUMMARY OF THE INVENTION The present invention relates to novel metallocene compounds capable of providing propylene homo- and copolymers having high melting point and high molecular weight. The present invention further relates to metallocene catalyst compositions comprising one or more of these compounds and one or more activators or cocatalysts, and optionally, support material, and to the use of such catalyst compositions in polymerization, in particular propylene polymerization. In one aspect, the present invention provides metallocene compounds represented by formula (I): wherein: M 1 is selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten; R 1 and R 2 are selected from hydrogen, halogen, hydroxy, Ci-Cio alkyl groups, - Cio alkoxy groups, C 6 -Cι aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 0 alkylaryl groups and C 7 -C 40 arylalkenyl groups; or R and R are joined together to form a C -C 0 alkanediyl group or a conjugated diene ligand which is coordinated to M 1 in a metallacyclopentene 1 fashion; or R and R represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not counting hydrogen and forming a π complex with M 1 ; R is selected from hydrogen, halogen, Ci-Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR' 2 , -SR', -OR', -SiR' 3 , -OSiR' 3 and -PR' 2 radicals wherein each R' is independently selected from halogen, Ci-Qo alkyl groups and C 6 -Cι 4 aryl groups; R 4 , R 6 and R 7 are each independently selected from hydrogen, halogen, Ci- Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR' 2 , -SR', -OR', -SiR' 3 , -OSiR' 3 and -PR' 2 radicals wherein each R' is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; or R 6 and R 7 together with the atoms connecting them may form one or more rings; R 5 is selected from halogen, Cι-Cι 0 alkyl groups, C 6 - 4 aryl groups, C 2 - Cio alkenyl groups, C 7 -C 40 arylalkyl groups, C -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR' 2 , -SR', -OR, -SiR' 3 , -OSiR' 3 and -PR' 2 radicals wherein each R' is independently selected from halogen, CpCio alkyl groups and C 6 -Cι 4 aryl groups; provided that if R 6 is methyl or F, R 5 is different from R 6 ; R 8 , R 9 , R 10 , R u and R 12 are each independently as defined for R 4 , R 6 and R 7 , provided that if R s , R 9 , R 11 and R 12 all are hydrogen, then at least one of R 3 , R 5 and R 10 is different from methyl, with R 10 being different from hydrogen; and further provided that if R 8 , R 10 and R 12 all are hydrogen, R 3 is ethyl and R 5 is methyl, then at least one of R 9 and R 11 is different from methyl; R is selected from I I I -M 3 - -M 3 - M 3 - -0-M 3 -O- -B(R 14 )-, -A1(R 14 )-, -Ge-, -Sn-, -O-, -S-, -SO-, -SO 2 -, -N(R 14 )-, -CO-, - P(R 14 )- -P(O)(R 14 )-, -B(NR 14 R 15 )- and -B[N(SiR 14 R 15 R 16 ) 2 ]-; wherein: R 14 , R 15 and R 16 are each independently selected from hydrogen, halogen, Cι-C 20 alkyl groups, C 6 -C 30 aryl groups, Cι-C 20 alkoxy groups, C 2 -C 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 8 -C 40 arylalkenyl groups and C -C 40 alkylaryl groups, or R 14 and R 15 , together with the atom(s) connecting them, form a ring; and M is selected from carbon, silicon, germanium and tin; or R is represented by the formula wherein: R", R , 1 1 8 8 , R, 1 ι 9 y , r R)20 υ , r R>2"1, r R>2X2 D R2 Z 3 J and R 2 M 4 are each independently selected from hydrogen, halogen, hydroxy, C1-C10 alkyl groups, Ci- o alkoxy groups, C 6 - Cι 4 aryl groups, C 6 -C )4 aryloxy groups, C 2 -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 8 -C 40 arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 , including R 20 and R 21 , together with the atoms connecting them, form one or more rings; and M 2 represents one or more carbon atoms, or a silicon, germanium or tin atom (where M 2 represents more than one atom, preferably each M 2 atom is bound such that no one M 2 atom is bound to both indenyl moieties). In preferred embodiments of the above compound, M 1 is selected from titanium, zirconium and hafnium. 1 9 In one aspect, R and R are selected from chlorine, Cι-C 6 alkyl groups, C 6 -Cιo aryl groups, C 7 - 2 arylalkyl groups and C 7 -Cι 2 alkylaryl groups. For example, R 1 and R 2 may be methyl. In another aspect, R may be a Cι-C 6 alkyl group such as, e.g., a -C alkyl group and, in particular, an isopropyl group, or may be a phenyl group. Preferably, at least one of R 4 and R , and most preferred both of them, represent hydrogen atoms. For example, R 4 , R and R 12 may all be hydrogen atoms. In yet another aspect, R 5 may be a Cι-C 6 alkyl group, e.g., a methyl group, or may be a phenyl group. In a further aspect, R 12 may be hydrogen. For example, R 12 may be hydrogen and at least one of R 9 and R 11 may different from hydrogen. In another aspect, R 9 and R 11 represent a Cι-C 4 alkyl group such as methyl or tert-butyl, or a phenyl group. In the above formula, M 3 may, for example, be selected from carbon and silicon, and R 14 , R 15 and R 16 may independently be selected from Cι-C 4 alkyl groups and C ό -Cio aryl groups. Moreover, when R is represented by the formula: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 may each be hydrogen, with M 2 representing a silicon atom. Particularly preferred compounds of the above formula include those wherein R 1 and R 2 are selected from chlorine, methyl, neopentyl and benzyl, R 3 is selected from Cι-C 4 alkyl groups, each of R 4 , R 8 and R 12 is hydrogen, and R 5 is selected from Cι-C 4 alkyl groups and C 6 -Cι 0 aryl groups; wherein R 3 is selected from branched C 3 -C 4 alkyl groups and R 5 is selected from Cι-C 4 alkyl groups; wherein R 3 is selected from isopropyl, isobutyl, sec-butyl, tert-butyl and phenyl groups, and R 5 is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, phenyl, tolyl, benzyl and naphthyl groups; and wherein M 1 is selected from zirconium and hafnium; R 1 and R 2 are selected from chlorine, Cι-C 3 alkyl groups and C 6 -Cι 0 aryl groups; R 3 is selected from Cι-C 4 alkyl groups and C 6 -Cι 0 aryl groups; R 4 and R 8 are hydrogen; R 5 , R 6 , R 7 , R 9 , R 10 , 1 1 1 R and R are each independently selected from hydrogen, halogen and Cι-C 4 alkyl groups; R 5 is selected from Cι-C 6 alkyl groups and C 6 -Cι 0 aryl groups; and R 13 is selected from di(C j -C 4 alkyl)silanediyl, diphenylsilanediyl, (Cι-C 4 alkyl)- phenylsilanediyl, diphenylmethanediyl and C 2 -C 4 alkanediyl and alkenediyl radicals, and groups of the formula: wherein: R", R' δ , R ιy , R zu , R 1 , R , R J and R are each independently selected from hydrogen, halogen and Cι-C 3 alkyl groups; and M 2 represents a carbon or silicon atom. ' In another aspect, R 13 may be selected from di(Cι-C 4 alkyl)silanediyl, diphenylsilanediyl, (Cι-C 4 alkyl)phenylsilanediyl, C 2 -C alkanediyl and alkenediyl, di(Cj-C 4 alkyl)amidoborane and bis[tri(Cι-C 4 alkyl)silyl]amidoborane radicals. Other preferred compounds of the above formula may comprise not more than 2 % of the meso isomer. In another aspect, the metallocenes of this invention are represented by the above formula (I), wherein: M 1 is selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten; 1 9 R and R are selected from hydrogen, halogen, hydroxy, -Cio alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -Cιo alkenyl groups, C -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 7 -C 4 o arylalkenyl groups; or R 1 and R 2 are joined together to form an alkanediyl group or a conjugated C 4 -C 40 diene ligand which is coordinated to M 1 in a metallacyclopentene fashion; or R 1 and R 2 represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not counting hydrogen and forming a π complex with M 1 ; R 3 is selected from hydrogen, halogen, Cj-Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C -C 40 arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR' 2 , -SR, -OR, -SiR 3 , -OSiR 3 and -PR' 2 radicals wherein each R is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; R 4 , R 6 and R 7 are each independently selected from hydrogen, halogen, Ci- Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 -C 4 o arylalkenyl groups, and -NR' 2 , -SR', -OR, -SiR 3 , -OSiR' 3 and -PR 2 radicals wherein each R is independently selected from halogen, Cj-Cio alkyl groups and C 6 -Cι 4 aryl groups; or R 6 and R 7 together with the atoms connecting them may form one or more rings; R 5 is selected from halogen, Ci-Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 - Cio alkenyl groups, C -C 40 arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR' 2 , -SR', -OR, -SiR' 3 , -OSiR' 3 and -PR' 2 radicals wherein each R is independently selected from halogen, Ci- o alkyl groups and C 6 -Cι aryl groups; R 8 , R 9 , R 10 , R 11 and R 12 are each independently as defined for R 4 , R 6 and 7 R Q 10 1 1 19 R , provided that two or more adjacent radicals R , R , R , R and R together with the atoms connecting them may form one or more rings; R 13 is selected from diphenylsilanediyl, (Cι-C 4 alkyl)phenylsilanediyl, di(Cι-C 4 alkyl)amidoborane and bis[tri(Cι-C 4 alkyl)silyl]amidoborane radicals and groups of the formula: - 10 - wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen, hydroxy, -Cio alkyl groups, -Cio alkoxy groups, C 6 - Cι 4 aryl groups, C 6 - aryloxy groups, C 2 -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 8 -C o arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 , including R 20 and R 21 , together with the atoms connecting them, form one or more rings; and M represents a carbon, silicon or germanium atom. In yet another aspect, the metallocenes of this invention are represented by the above formula (I), wherein: M 1 is selected from titanium, zirconium and hafnium; 1 9 R and R are selected from hydrogen, halogen, hydroxy, Ci- o alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 4 o alkylaryl groups and C 7 -C 40 arylalkenyl groups, provided that at least one of R 1 and R 2 is different from halogen; or R 1 and R 2 are joined together to form a C 4 -C 40 alkanediyl group or a conjugated C 4 -C 40 diene ligand which is coordinated to M 1 in a metallacyclopentene fashion; or R and R represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not counting hydrogen and forming a π complex with M 1 ; R 3 is selected from hydrogen, halogen, Ci-Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR 2 , -SR, -OR, -SiR' 3 , -OSiR 3 and -PR' 2 radicals wherein each R is independently selected from halogen, Q-Cio alkyl groups and C 6 -Cι 4 aryl groups; R , R 6 and R 7 are each independently selected from hydrogen, halogen, - Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cι 0 alkenyl groups, C 7 -C 0 arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 -C 4 o arylalkenyl groups, and -NR' , -SR, -OR', -SiR 3 , -OSiR' 3 and -PR' 2 radicals wherein each R' is independently selected from halogen, -Cio alkyl groups and C 6 -Cι 4 aryl groups; or R 6 and R 7 together with the atoms connecting them may form one or more rings; R 5 is selected from halogen, -Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 - Cio alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR' 2 , -SR, -OR', -SiR' 3 , -OSiR' 3 and -PR' 2 radicals wherein each R' is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; R 8 , R 9 , R 10 , R 11 and R 12 are each independently as defined for R 4 , R 6 and R 7 , provided that two or more adjacent radicals R 8 , R 9 , R 10 , R 11 and R 12 together with the atoms connecting them may form one or more rings; R 13 is selected from j I I 1 -M 3 - -M 3 - M 3 - -O-M 3 -0- I I 1 1 1 I I R15 R16 R 115 R 115 R 115 R 115 -B(R 14 )-, -A1(R 14 )-, -Ge-, -Sn-, -O-, -S-, -SO-, -SO 2 -, -N(R 14 )-, -CO- P(R 14 )- -P(O)(R 14 )-, -B(NR 14 R 15 )- and -B[N(SiR 14 R 15 R 16 ) 2 ]-; wherein: R 14 , R 15 and R 16 are each independently selected from hydrogen, halogen, Cι-C 20 alkyl groups, C 6 -C 30 aryl groups, Cι-C 20 alkoxy groups, C 2 -C 20 alkenyl groups, C 7 -C 40 arylalkyl groups, C 8 -C 40 arylalkenyl groups and C 7 -C 0 alkylaryl groups, or R 14 and R 15 , together with the atom(s) connecting them, form a ring; and M is selected from carbon, silicon, germanium and tin; or R 13 is represented by the formula wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen, hydroxy, Ci-Cio alkyl groups, Ci-Cio alkoxy groups, C O - C M aryl groups, C 6 -Cι 4 aryloxy groups, C -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 8 -C 40 arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 , including R 20 and R 21 , together with the atoms connecting them, form one or more rings; and M 2 represents one or more carbon atoms, or a silicon, germanium or tin atom. Preferred embodiments of the above compounds are those already given before. The present invention also provides a catalyst composition which comprises the product of a compound of at least one of the above metallocene compounds of the present invention and a cocatalyst. The cocatalyst may be a compound comprising a non-coordinating anion (e.g., a non-coordinating anion comprising at least one unit of the formula -B(C 6 F 5 ) 3 ) and/or may be an alumoxane, e.g., methylalun oxane. The catalyst composition may comprise a support material, e.g., an inorganic material such as silica, alumina, silica-alumina and magnesium chloride. Preferred support materials include silica having a surface area ranging from 10 to 700 m 2 /g, a total pore volume ranging from 0.1 to 4.0 cc/g and an average particle size ranging from 10 to 500 μm. The present invention further provides a polymerization process which comprises contacting, under polymerization conditions, one or more ethylenically unsaturated monomers and a catalyst composition as defined above. The ethylenically unsaturated monomers preferably are selected from monoolefins, diolefins and mixtures thereof. Illustrative and non-limiting examples of suitable monoolefins are compounds of the formula R a CH=CHR b wherein R a and R b are each independently selected from hydrogen, alkyl and alkenyl radicals having 1 to 14 carbon atoms or, together with the carbon atoms to which they are connected, form a ring having 4 to 8 carbon atoms. Preferred monoolefins include ethylene and α-olefins having from 3 to 12 carbon atoms such as, e.g., propylene, 1-butene, 4-methyl-l-pentene, 1-hexene, 1-octene and mixtures thereof. In a preferred embodiment, the ethylenically unsaturated monomers consist essentially of ethylene and propylene. In one aspect of the above process, the temperature ranges from about 30° C to about 80° C. In another aspect, the process is carried out at a pressure ranging from about 5 to about 64 bar. DETAILED DESCRIPTION In the following detailed description, unless otherwise stated, all percentages, parts, ratios, etc., are by weight. Also, unless otherwise stated, a reference to a compound or component includes the compound or component by itself, its individual stereoisomers and any mixtures thereof, of as well as any combination with other compounds or components, such as mixtures of compounds. Further, when an amount, concentration, or other value or parameter, is given as a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of an upper preferred value and a lower preferred value, regardless whether ranges are separately disclosed. Additionally, as utilized herein, the following terms have the meanings indicated below. The term "product" in connection with the catalyst composition of the present invention includes any species that is different in any respect from the completely independent and individual materials, i.e., the metallocene compound (catalyst precursor) and the cocatalyst (activator). By way of illustrative, non- limiting example, these individual materials may have interacted or even reacted, giving rise to a contact product and/or reaction product. The term "alkyl", means a straight-chain, branched-chain or cyclic alkyl radical. Examples of such radicals include, but are not limited to, methyl, ethyl, n- propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl, iso-amyl, hexyl, 2-ethylhexyl, octyl, cyclopentyl, cyclohexyl and the like. The cyclic alkyl radicals may be substituted with one or more straight-chain and/or branched-chain alkyl radicals (i.e., may be alkylcycloalkyl radicals such as, e.g., methylcyclohexyl etc.). Conversely, the straight-chain and branched-chain alkyl radicals may be substituted with one or more cyclic alkyl radicals (i.e., may be cycloalkylalkyl radicals such as cyclohexylmethyl etc.). Moreover, unless indicated otherwise, the above alkyl radicals may be substituted by one or more groups preferably and independently selected from halogen (e.g., F, CI, Br), alkoxy (e.g., methoxy, ethoxy, propoxy, butoxy and the like), hydroxy, amino, monoalkylamino (e.g., methylamino, ethylamino, propylamino and the like) and dialkylamino (e.g., dimethylamino, diethylamino, dipropylamino, diisopropylamino, piperidino and the like) and trihydrocarbylsilyl (e.g., trimethylsilyl, triphenylsilyl and the like). The term "alkenyl" means "alkyl" as defined above having one or more double and/or triple bonds. Examples of alkenyl radicals include, but are not limited to, ethenyl, propenyl, allyl, butenyl, propargyl, 1,4-butadienyl, isopropenyl, cyclopentenyl, cyclohexenyl, cyclooctenyl, cyclopentadienyl, cyclohexadienyl, cyclooctadienyl and the like. The term "alkoxy" means an alkyl or alkenyl ether radical wherein the terms "alkyl" and "alkenyl" are as defined above. Examples of suitable alkyl ether radicals include, but are not limited to, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, iso-butoxy, sec-butoxy, tert-butoxy, allyloxy, trifluoromethoxy and the like. The term "aryl" means an aromatic radical, for example, a phenyl, naphthyl, azulenyl, phenanthryl or anthracenyl radical and the like which optionally contains one or more, (e.g., 2 or 3) heteroatoms (preferably selected from N, O and S and combinations thereof) in the ring and/or carries one or more identical or different substituents, for example, alkoxy, aryl, halogen, hydroxy, amino, monoalkylamino, dialkylamino, nitro, trihydrocarbylsilyl, alkyl-CO, alkylsulfonyl, alkyl-OCO etc., these terms being as defined herein. Illustrative, non-limiting examples of aryl radicals are phenyl, naphthyl, fluorenyl, chlorophenyl, dichlorophenyl, fluorophenyl, perfluorophenyl, hydroxyphenyl, anisyl, biphenyl, nitrophenyl, acetylphenyl, aminophenyl, pyridyl, pyridazyl, quinolyl, and the like. When carbon numbers are given herein for aryl radicals, ring heteroatoms are counted as carbon atoms. The term "aryloxy" means an aryl ether radical wherein the term "aryl" is as defined above. The term "alkylaryl" means an aryl radical carrying at least one alkyl and/or alkenyl radical as ring substituent, the terms "aryl", "alkyl" and "alkenyl" being as defined above. Illustrative, non-limiting examples of alkylaryl groups are tolyl, xylyl, mesityl, ethylphenyl, trifluoromethylphenyl, vinylphenyl, cumyl, methylpyridyl and the like. The term "arylalkyl" means an alkyl radical carrying at least one aryl group wherein the terms "aryl" and "alkyl" are as defined above, provided that the aryl radical may have one or more alkyl substituents. Illustrative, non-limiting examples of arylalkyl groups are benzyl, phenethyl, diphenylmethyl, tolylmethyl, naphthylmethyl and the like. The term "arylalkenyl" means an alkenyl radical carrying at least one aryl substituent wherein the terms "aryl" and "alkenyl" are as defined above, provided that the aryl radical may have one or more alkyl substituents. Illustrative, non- limiting examples of arylalkenyl groups are styryl, methylstyryl, phenylpropenyl, l-phenyl-l,4-butadienyl and the like. The term "halogen" means fluorine, chlorine, bromine and iodine. The term "hydrocarbyl" encompasses alkyl, alkenyl, arylalkyl , arylalkenyl and alkylaryl groups as defined above. Preferred hydrocarbyl groups comprise 1 to 20, more preferred 1 to 10, and most preferred 1 to 6 carbon atoms. Illustrative, non-limiting examples are methyl, ethyl, propyl and phenyl. Unless specified otherwise herein, preferred meanings of the various groups defined above are: Alkyl: linear and branched alkyl groups having 1 to 8, particularly 1 to 6, and even more preferred, 1 to 4 carbon atoms (such as, e.g., methyl, ethyl, propyl and isopropyl). If present, substituents are preferably selected from halogen and alkoxy, more preferred from F, CI, methoxy and ethoxy, most preferred from F and CI. Alkoxy: the preferred alkyl groups connected to an oxygen atom, more preferred methoxy and ethoxy. Alkenyl: linear and branched alkenyl groups having 2 to 8, particularly 2 to 6, and even more preferred, 2 to 4 carbon atoms (such as, e.g., vinyl, allyl, and 2-butenyl). If present, substituents are preferably selected from halogen and alkoxy, more preferred from F, CI, methoxy and ethoxy, most preferred from F and CI. Aryl: aryl groups containing 6 to 12, more preferred 6 to 10 carbon atoms, such as, e.g., phenyl, naphthyl and biphenyl. Preferably no heteroatoms are present on the ring system. If present, substituents are preferably selected from halogen and alkoxy, more preferred from F, CI, methoxy and ethoxy, most preferred from F and CI. Whenever specific aryl groups such as phenyl, naphthyl and biphenyl are mentioned in the specification and/or the claims, unless stated otherwise these aryl groups may carry one, two, three or more substituents which may be the same or different and are preferably selected from alkyl (as defined above), halogen and alkoxy. Aryloxy: the preferred aryl groups attached to an oxygen atom. Most preferred are phenoxy and naphthoxy. Arylalkyl and alkylaryl: the preferred aryl groups in combination with the preferred alkyl groups, the total number of carbon atoms being 7 to 20, more preferred 7 to 12. Particularly preferred examples include benzyl, phenethyl, tolyl and xylyl. Arylalkenyl: the preferred aryl groups in combination with the preferred alkenyl groups, the total number of carbon atoms being 8 to 20, more preferred 8 to 12. Particularly preferred examples include styryl and chlorostyryl. Halogen: F, CI and Br, more preferred F and CI. Preferred meanings of the various constituents of the compounds of formula (I) above are as follows, it being understood that these preferred meanings are defined as above, including the preferred embodiments of a particular meaning. For example, "alkyl" means an alkyl group as defined above, preferred meanings thereof being also as defined above. M 1 : titanium, zirconium, hafnium; more preferred are zirconium and hafnium, with zirconium being most preferred. R 1 and R 2 : halogen (more preferred CI and Br), alkyl (more preferred methyl and neopentyl), aryl (more preferred phenyl), alkylaryl (more preferred tolyl) and arylalkyl (more preferred benzyl); or R 1 and R 2 are joined together to form a C 4 - 6 alkanediyl group or a conjugated C 4 -C 6 diene ligand which is 1 1 coordinated to M in a metallacycloalkane or -cycloalkene fashion; or R and R represent a conjugated diene, optionally substituted with one or more groups independently selected from alkyl, aryl, trialkylsilyl and trialkylsilylalkyl groups, said diene having a total of up to 30, e.g., up to 24 atoms not counting hydrogen and forming a π complex with M 1 . Illustrative, non-limiting examples of conjugated dienes are 1,4-diphenyl- 1,3 -butadiene, 1,3-pentadiene, 2-methy 1-1,3 - pentadiene, 2,4-hexadiene, 1 -phenyl- 1,3-pentadiene, 1,4-dibenzyl- 1,3 -butadiene, 1,4-ditolyl- 1,3 -butadiene, l,4-bis(trimethylsilyl)-l,3-butadiene, and 1,4- dinaphthyl- 1,3 -butadiene. While R 1 and R 2 may be different, they are preferably 1 9 the same. The most preferred meanings of R and R are CI and methyl. R 3 : alkyl, aryl, alkylaryl and arylalkyl. More preferred meanings are methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, phenyl, naphthyl, tolyl and benzyl, even more preferred isopropyl, benzyl and phenyl. Most preferred is isopropyl. R 4 , R 6 and R 7 : hydrogen, alkyl and aryl (particularly phenyl), more preferred hydrogen and alkyl. Illustrative, non-limiting examples are hydrogen, methyl and ethyl. For R , a particularly preferred meaning is hydrogen. In another preferred embodiment, all of R 4 , R 5 , R 6 and R 7 are hydrogen. R 5 : alkyl, aryl, alkylaryl, arylalkyl and trialkylsilyl. More preferred meanings are methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert- butyl, phenyl, naphthyl, (o-, m- and p-)tolyl, benzyl and trimethylsilyl. R 8 , R 9 , R 10 , R 11 and R 12 : hydrogen, alkyl, arylalkyl (particularly benzyl) and aryl (particularly phenyl), more preferred hydrogen and alkyl. Illustrative, non-limiting examples are hydrogen, methyl and ethyl. For R 8 , a particularly preferred meaning is hydrogen. In another preferred embodiment, all of R 8 , R 9 , R 10 and R 11 are hydrogen. While in still another preferred embodiment at least one of R 9 and R 11 is different from hydrogen, it is particularly preferred for R 11 to be different from hydrogen when R 12 represents methyl or ethyl. R 13 : dialkylsilanediyl, diarylsilanediyl, (aryl)(alkyl)silanediyl, amidoborane, alkylene, arylalkylene and arylene, the latter groups being derived from the defined alkyl, arylalkyl and aryl radicals. More preferred as alkyl and aryl groups are methyl, ethyl, propyl, butyl and phenyl. More preferred alkylene, arylalkylene and arylene radicals are ethylene, propylene, butylene, phenylmethylene and diphenylmethylene as well as phenylene. More preferred dialkylsilanediyl, diarylsilanediyl and (aryl)(alkyl)silanediyl radicals are dimethylsilanediyl, diethylsilanediyl, dipropylsilanediyl, dibutylsilanediyl, methylphenylsilanediyl and diphenylsilanediyl. More preferred amidoborane radicals are dialkylamidoborane, diarylatriidoborane and bis(trialkylsilyl)- amidoborane radicals. Illustrative, non-limiting examples thereof are dimethyl- amidoborane, diethylamidoborane, diisopropylamidoborane, diphenylamido- borane and bis(trimethylsilyl)amidoborane. Other preferred meanings of R 13 are 9- fluorenyl and 9-silafluorenyl. R 13 is usually connected to the 1 -positions of the indenyl ring systems. Furthermore, whenever it is stated in the present specification and/or in the claims that a certain radical (e.g., R) "is different from" one or more recited - 19 - groups, unless stated otherwise this phrase means that this radical can have any of its other indicated meanings, including hydrogen. The following are illustrative, non-limiting examples of metallocenes of the present invention: dimethylsilanediylbis 1 -(2-ethyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-n-propyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-isopropyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-n-butyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-isobutyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-sec-butyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-tert-butyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 1 -(5-methyl-2,4-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-trifluoromethyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-trimethylsilyl-5-methyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-methyl-5-trifluoromethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis l-(2-methyl-5-trimethylsilyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 1 -[2,5,6-trimethyl-4-(3,5-dimethyl)phenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -(2-methyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2,5-diethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-n-propyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-isopropyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-n-butyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-isobutyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-sec-butyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-tert-butyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 5 -ethyl-2,4-diphenylindenyl)] zirconium dichloride; dimethylsilanediylbis 2-methyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-ethyl-5-n-propyl 4-phenylindenyl)] zirconium dichloride; dimethylsilanediylbis 2,5-di-n-propyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-isopropyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-n-butyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-isobutyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-sec-butyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-tert-butyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis 5-n-propyl-2,4-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis 2-methyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-ethyl-5-isopropyl 4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-n-propyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis [ 1 -(2,5-diisopropyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-n-butyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-isobutyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-sec-butyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-tert-butyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbisf 1 -(5-isopropyl-2,4-diphenylindenyl)jzirconium dichloride; dimethylsilanediylbis[l-(2-methyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis [1 -(2-ethy 1-5 -n-butyl 4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-n-propyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-isopropyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-di-n-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-isobutyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-sec-butyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-tert-butyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(5-n-butyl-2,4-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-methyl-5-isobutyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-ethyl-5-isobutyl 4-phenylindenyl)] zirconium dichloride; dimethylsilanediylbisfl -(2-n-propyl-5-isobutyl-4- phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-isopropyl-5-isobutyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis [ 1 -(2-n-butyl-5 -isobutyl 4-phenylindenyl)] zirconium dichloride; dimethylsilanediylbis[l-(2,5-diisobutyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-sec-butyl-5-isobutyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-tert-butyl-5-isobutyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(5-isobutyl-2,4-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-methyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-ethyl-5-sec-butyl 4-phenylindenyl)]zirconium dichloride; dimetliylsilanediylbis[l-(2-n-propyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-isopropyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-n-butyl-5-sec-butyl 4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-isobutyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2,5-di-sec-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-tert-butyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(5-sec-butyl-2,4-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-methyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis [ 1 -(2-ethyl-5-tert-butyl 4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-n-propyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[ 1 -(2-isopropyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-n-butyl-5-tert-butyl 4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis [ 1 -(2-isobutyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-sec-butyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis [ 1 -(2,5-di-tert-butyl-4-phenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(5-tert-butyl-2,4-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis [1 -(2-methyl-4,5-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis [ 1 -(2-ethy l-4,5-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-n-propyl-4,5-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-isopropyl-4,5-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-n-butyl-4,5-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-isobutyl-4,5-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis [ 1 -(2-sec-butyl-4,5-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2-tert-butyl-4,5-diphenylindenyl)]zirconium dichloride; dimethylsilanediylbis[l-(2,4,5-triphenylindenyl)]zirconium dichloride; dimethylsilanediylbis! l-[2,5-dimethyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis { 1 -[2-ethyl-5-methyl-4-(2-methylphenyl)indenyl] jzirconium dichloride; dimethylsilanediylbis { 1 - [2-n-propyl-5 -methyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 -[2-isopropyl-5-methyl-4-(2-methylphenyl)indenyl] }- zirconium dichloride; dimethylsilanediylbis 2-n-butyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-isobutyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-sec-butyl-5-methyl-4-(2-methylphenyl)indeny 1] } - zirconium dichloride; dimethylsilanediylbis 2-tert-butyl-5-methyl-4-(2-methylphenyl)indenyl ] } - zirconium dichloride; dimethylsilanediylbis 2-phenyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2,5-dimethyl-4-(2,3-dimethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis 2,5-dimethyl-4-(2,4-dimethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis 2,5-dimethyl-4-(2,3,4-trimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2,5-dimethyl-4-(2,3,5-trimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2,5-dimethyl-4-(2,3,4,5-tetramethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2-methyl-5 -ethyl-4-(2-methylphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis 2,5-diethyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis 2-n-propyl-5-ethyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-isopropyl-5-ethyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-n-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis { 2-isobutyl-5-ethyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 -[2-sec-butyl-5-ethyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 -[2-tert-butyl-5-ethyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! 1 -[2-phenyl-5-ethyl-4-(2-methylphenyl)indenyl] }zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis { 1 -[2-ethyl-5-n-propyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2,5-di-n-propyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-sec-butyl-5-n-propyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-isopropyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 - [2-ethyl-5 -isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-propyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2,5-diisopropyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; - 26 - dimethylsilanediylbis ! 2-n-butyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-isobutyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-sec-butyl-5-isopropyl-4-(2-methylphenyl)indenyl ] } - zirconium dichloride; dimethylsilanediylbis ! 2-tert-butyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-phenyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-methyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-ethyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-n-propyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-isopropyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 2-n-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-isobutyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-sec-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2,5-di-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ! 2-phenyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-methyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-ethyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; ■ 27 - dimethylsilanediylbis 1 -[2-n-propyl-5-phenyl-4-(2-methylρhenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-isopropyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-n-butyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-isobutyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-sec-butyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-tert-butyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis l-[2,5-diphenyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis l-[2,5-dimethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis l-[2-ethyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis 1 -[2-n-propyl-5-methyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis l-[2-isopropyl-5-methyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis l-[2-n-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 1 - [2-isobuty 1-5 -methyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 - [2-sec-butyl-5 -methyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-tert-butyl-5-methyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-phenyl-5-methyl-4-(2-ethylphenyl)indenyl] }zirconium dichloride; dimethylsilanediylbis [2-methyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ■ [2,5-diethyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis -[2-n-propyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis -[2-isopropyl-5-ethyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis [2-n-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis [2-isobutyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ■ [2-sec-butyl-5-ethyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis -[2-tert-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ■[2-phenyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ■[2-methyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ■ [2-ethy 1-5 -n-propyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis ■ [2,5 -di-n-propyl-4-(2-ethy lphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis -[2-isopropyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis -[2-n-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ■[2-isobutyl-5-n-ρropyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis -[2-sec-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis { 1 -[2-tert-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-methyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - [2-ethyl-5 -isopropyl-4-(2-ethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-propyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - [2,5-diisopropyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isobutyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-sec-butyl-5-isopropyl-4-(2-ethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-phenyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis!l-[2-methyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis!l-[2-ethyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis!l-[2-n-propyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis!l-[2-isopropyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis!l-[2-n-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis { 1 - 2-isobutyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2-sec-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2,5-di-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis { 1 - 2-phenyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-methy 1-5 -phenyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis { 1 - 2-ethyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis { 1 - 2-n-propy 1-5 -phenyl-4-(2-ethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-isopropyl-5-phenyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2-n-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis { 1 - 2-isobutyl-5-phenyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2-sec-butyl-5-phenyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! 1- 2-tert-butyl-5-phenyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2,5-diphenyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ! 1 - 2,5-dimethyl-4-(2-isopropylphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis ! 1 - 2-ethyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! 1 ■ [2-n-propyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-isopropyl-5-methyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-n-butyl-5-methyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-isobutyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-sec-butyl-5 -methy l-4-(2-isopropy lpheny l)indeny 1] } - zirconium dichloride; dimethylsilanediylbis { 2-tert-butyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-phenyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-methyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2,5-diethyl-4-(2-isopropylphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis { 2-n-propyl-5-ethyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-isopropyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-n-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-isobutyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-sec-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-tert-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-phenyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 2-methyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; ■ 32 - dimethylsilanediylbis 2-ethyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2,5-di-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-isopropyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-n-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-isobutyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-sec-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } ■ zirconium dichloride; dimethylsilanediylbis 2-tert-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2-phenyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-methy l-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-ethy 1-5 -isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-n-propyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2,5-diisopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-n-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2-isobutyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-sec-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-tert-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 03/050131 - 33 - dimethylsilanediylbis! 1 - 2-ρhenyl-5-isopropyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2-methy l-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2-ethyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2-n-propyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2-isopropyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! 1- 2-n-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! 1- 2-isobutyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-sec-butyl-5 -tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - 2,5-di-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-phenyl-5-tert-butyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-methyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-ethyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-n-propyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! 1- 2-isopropyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-n-butyl-5 -phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - 2-isobutyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis!l-[2-sec-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 - [2-tert-butyl-5-phenyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2,5-diphenyl-4-(2-isopropylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ! 1 -[2,5-dimethyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis { 1 - [2-ethyl-5-methyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-n-propyl-5-methyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 - [2-isopropyl-5 -methyl-4-(2-bipheny lyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - [2-n-butyl-5 -methyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis ! 1 - [2-isobutyl-5-methyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-methyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-methyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 - [2-phenyl-5-methyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis! l-[2,5-diethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis!l-[2-n-propyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis { 1 -[2-n-butyl-5-ethyl-4-(2-biphenylyl)indenyl] }zirconium dichloride; dimethylsilanediylbis { 1 -[2-isobutyl-5-ethyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! 1 -[2-sec-butyl-5-ethyl-4-(2-biphenylyl)indenyl] }zirconium dichloride; dimethylsilanediylbis { 1 -[2-tert-butyl-5-ethyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-n-propyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ! 1 -[2,5-di-n-propyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! 1 -[2-isopropyl-5-n-propyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - [2-n-buty 1-5 -n-propy l-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 -[2-isobutyl-5-n-propyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 -[2-sec-butyl-5-n-propyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 - [2-methy 1-5 -isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - [2-ethy 1-5 -isopropyl-4-(2-biphenylyl)indeny 1] } zirconium dichloride; • 36 . dimethylsilanediylbis 1- 2-n-propyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2,5-diisopropyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis 2-n-butyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-isobutyl-5-isopropyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2-sec-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2-tert-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2-phenyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-methyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 2-ethyl-5 -tert-buty l-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis 1- 2-n-propyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 2-isopropyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-n-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-isobutyl-5 -tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2-sec-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1- 2,5-di-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis 2-phenyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; ■ 37 - dimethylsilanediylbis ! 2-methy l-5-phenyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! 2-ethyl-5-phenyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! 2-n-propyl-5-phenyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-isopropyl-5-phenyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! 2-n-butyl-5-phenyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; dimethylsilanediylbis ! 2-isobutyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ! 2-sec-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 2-tert-butyl-5 -phenyl-4-(2-biphenylyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2,5-diphenyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ! 2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ! 2-n-propyl-5-methyl-4-(3 ,5-dimethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-isopropyl-5-methyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-n-buty 1-5 -methy l-4-(3 ,5 -dimethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-isobutyl-5-methyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-sec-butyl-5-methyl-4-(3 ,5-dimethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 2-tert-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 1 -[2-phenyl-5-methyl-4-(3,5-dimethylphenyl)indenyl] }- zirconium dichloride; dimethylsilanediylbis 1 -[2-methyl-5-ethyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis l-[2,5-diethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis l-[2-n-propyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 1 - [2-isopropyl-5-ethyl-4-(3 ,5 -dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-n-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl] }- zirconium dichloride; dimethylsilanediylbis l-[2-isobutyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride dimethylsilanediylbis 1 -[2-sec-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl] }- zirconium dichloride; dimethylsilanediylbis 1 -[2-tert-butyl-5-ethyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis 1 -[2-phenyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis l-[2-methyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis l-[2-ethyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis l-[2,5-di-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis 1 -[2-isopropyl-5-n-propyl-4-(3 ,5-dimethylphenyl)- indenyl]} zirconium diicchhlloorriiddee; dimethylsilanediylbis 1 -[2-n-butyl-5-n-propyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis l-[2-isobutyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis!l-[2-sec-butyl-5-n-propyl-4-(3,5-dimethylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-n-propyl-4-(3,5-dimethylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2-methyl-5-isopropyl-4-(3 ,5-dimethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - [2-ethyl-5-isopropyl-4-(3 ,5-dimethy lphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-propyl-5-isopropyl-4-(3 ,5-dimethylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-diisopropyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-butyl-5-isopropyl-4-(3 ,5-dimethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isobutyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-isopropyl-4-(3,5-dimethylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-isopropyl-4-(3,5-dimethylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2-phenyl-5-isopropyl-4-(3 ,5-dimethy lphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis!l-[2-n-propyl-5-tert-butyl-4-(3,5-dimethylphenyl)- indenyl] }zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-tert-butyl-4-(3,5-dimethylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-n-butyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis { 1 - [2-sec-butyl-5 -tert-butyl-4-(3 , 5 -dimethy lpheny 1)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-di-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-phenyl-5-tert-butyl-4-(3 ,5-dimethy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 - [2-ethyl-5-phenyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 - [2-n-propyl-5 -phenyl-4-(3 ,5 -dimethy lpheny l)indeny 1] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isopropyl-5-phenyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis{l-[2-n-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis { 1 -[2-isobutyl-5-phenyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-sec-butyl-5-phenyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis{l-[2,5-diphenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride; dimethylsilanediylbis ! 1 -[2,5-dimethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-propyl-5-methyl-4-(3 ,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-methyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert j butyl-5-methyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] }zirconium dichloride; dimethylsilanediylbis!l-[2-phenyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! 1 -[2-methyl-5-ethyl-4-(3 ,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2,5-diethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-n-propyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-ethyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-ethyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; . dimethylsilanediylbis! l-[2-tert-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] }zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-methyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-di-n-propyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-n-propyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis ! 1 - [2-isobutyl-5-n-propyl-4-(3 ,5 -bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] }zirconium dichloride; dimethylsilanediylbis ! 1 - [2-tert-butyl-5 -n-propy l-4-(3 ,5 -bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2-methy 1-5 -isopropy l-4-(3 ,5 -bis-trifluoromethyl- phenyl)indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-propyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2,5-diisopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] }zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 - [2-sec-butyl-5-isopropyl-4-(3 ,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis { 1 -[2-phenyl-5-isopropyl-4-(3 ,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! 1 -[2-methyl-5 -tert-buty l-4-(3, 5 -bis-trifluoromethy 1- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-tert-butyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl- pheny l)indeny 1] } zirconium dichloride ; dimethylsilanediylbis ! 1 -[2-isopropyl-5-tert-butyl-4-( ,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis ! 1 - [2-isobutyl-5 -tert-buty l-4-(3 , 5 -bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis!l-[2,5-di-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-propyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-phenyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-isobutyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-sec-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-diphenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-dimethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 -[2-n-propyl-5-methyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2-isopropyl-5 -methyl-4-(3 , 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2-n-butyl-5 -methyl-4-(3 ,5 -bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-sec-butyl-5-methyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-tert-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- • indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-methyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2,5-diethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis!l-[2-n-propyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis{l-[2-isopropyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-ethyl-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 - [2, 5 -di-n-propy l-4-(3 , 5 -bis-trimethy lsily 1- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis { 1 - [2-isopropyl-5 -n-propy l-4-(3 , 5-bis-trimethylsilyl- phenyl)indenyl]} zirconium dichloride; dimethylsilanediylbis! 1 -[2-n-butyl-5-n-propyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-ethyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 -[2-n-propyl-5-isopropyl-4-(3 ,5 -bis-trimethylsilyl- pheny l)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2,5-diisopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis ! 1 -[2-tert-butyl-5-isopropyl-4-(3 ,5-bis-trimethylsilyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-tert-butyl-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis { 1 -[2-n-propyl-5 -tert-buty l-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl- phenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2-sec-butyl-5-tert-butyl-4-(3 ,5 -bis-trimethylsilyl- phenyl)indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-di-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-phenyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-n-propyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isopropyl-5-phenyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2 -n-butyl-5-phenyl-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-diphenyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2,5-dimethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-ethyl-5-methyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! 1 -[2-n-propyl-5-methyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-isopropyl-5-methyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-butyl-5-methyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis!l-[2-isobutyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethy lsilanediylbis { 1 - [2-sec-butyl-5 -methyl-4-(3 ,5 -diisopropy lpheny 1)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-tert-butyl-5-methyl-4-(3 ,5 -diisopropy lpheny 1)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-ethyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2,5 -diethyl-4-(3 , 5 -diisopropy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-n-propyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! 1 -[2-isopropyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl] }- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-butyl-5-ethyl-4-(3 ,5-diisopropy lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isobutyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-phenyl-5-ethyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis{l-[2-methyl-5-n-propyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 -[2-ethyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis!l-[2,5-di-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isopropyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)- indenyl]zirconium dichloride; dimethylsilanediylbis { 1 -[2-n-butyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)indenyl] } zirconium dichloride; dimethylsilanediylbis { 1 -[2-isobutyl-5-n-propyl-4-(3 , 5 -diisopropy lpheny 1)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-sec-butyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-isopropyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 - [2-n-propyl-5-isopropyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2,5-diisopropyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-isopropyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-sec-butyl-5-isopropyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-tert-butyl-5-isopropyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-isopropyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis!l-[2-ethyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; 03/050131 - 50 - dimethylsilanediylbis!l-[2-n-propyl-5-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-butyl-5-tert-butyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-tert-butyl-4-(3, 5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-sec-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-di-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2 -phenyl-5-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-n-propyl-5-phenyl-4-(3,5-diisopropylphenyl)- indenyl] }zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-phenyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isobutyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-phenyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 -[2-tert-butyl-5-phenyl-4-(3 ,5-diisopropylphenyl)- indenyl] } zirconium dichloride; dimethylsilanediylbis! l-[2,5-diphenyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; 03/050131 - 51 - dimethylsilanediylbis{l-[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 - [2-ethyl-5-methyl-4-(3 ,5-di-tert-buty lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-propyl-5-methyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 -[2-isopropyl-5-methyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-methyl-4-(3, 5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-sec-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2 -tert-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2,5-diethyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-propyl-5-ethyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis!l-[2-isopropyl-5-ethyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-n-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isobutyl-5-ethyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis!l-[2-sec-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis{l-[2-tert-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-n-propyl-4-(3, 5 -di-tert-buty lpheny 1)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-n-propyl-4 : (3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2,5-di-n-propyl-4-(3,5-di-tert-butylphenyl)- indenyl] }zirconium dichloride; dimethylsilanediylbis { 1 -[2-isopropyl-5-n-propyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis!l-[2-n-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 - [2-tert-buty 1-5 -n-propyl-4-(3 , 5-di-tert-butylphenyl)- indenyl] }zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-ethyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-propyl-5-isopropyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 -[2,5-diisopropyl-4-(3,5-di-tert- butylphenyl)indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-isoρropyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-isobutyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-isopropyl-4-(3, 5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 -[2-tert-butyl-5-isopropyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-isopropyl-4-(3, 5 -di-tert-buty lpheny 1)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-methyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-ethyl-5-tert-butyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-n-propyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-isopropyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-butyl-5-tert-butyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2-isobutyl-5-tert-butyl-4-(3 , 5 -di-tert-buty lpheny 1)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 -[2,5-di-tert-butyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; dimethylsilanediylbis! l-[2-phenyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis ! 1 - [2-methy 1-5 -phenyl-4-(3 ,5 -di-tert-buty lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis { 1 - [2-ethy l-5-phenyl-4-(3 ,5-di-tert-buty lpheny l)indenyl] } - zirconium dichloride; dimethylsilanediylbis ! 1 -[2-n-propyl-5-phenyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis { 1 - [2-isopropyl-5-phenyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-n-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; dimethylsilanediylbis! l-[2-isobutyl-5-phenyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-sec-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2-tert-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis! l-[2,5-diphenyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; dimethylsilanediylbis[l-(2,5-dimethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-ethyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbisfl -(2-n-propyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-isopropyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-n-butyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-isobutyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-sec-butyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-tert-butyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(5-methyl-2,4-diphenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-trifluoromethyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-trimethylsilyl-5-methyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-methyl-5-trifluoromethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-methyl-5-trimethylsilyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [1 -(2,5,6-trimethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [l-(2-methyl-5-ethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2,5-diethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-n-propyl-5-ethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-isopropyl-5-ethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-n-butyl-5-ethyl-4-phenylindenyl)]zirconium dimethyl; dimethy lsilanediy Ibis [l-(2-isobuty 1-5 -ethyl-4-phenylindenyl)] zirconium dimethyl; dimethylsilanediylbis[l-(2-sec-butyl-5-ethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [ 1 -(2-tert-butyl-5-ethyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(5-ethyl-2,4-diphenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-methyl-5-n-propyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [1 -(2-ethy 1-5-n-propyl 4-phenylindenyl)] zirconium dimethyl; dimethylsilanediylbis[l-(2,5-di-n-propyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-isopropyl-5-n-propyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-n-butyl-5-n-propyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-isobutyl-5-n-propyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [ 1 -(2-sec-butyl-5 -n-propyl-4-pheny lindenyl)] zirconium dimethyl; dimethylsilanediylbis[l-(2-tert-butyl-5-n-propyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(5-n-propyl-2,4-diphenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-methyl-5-isopropyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-ethyl-5-isopropyl 4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-n-propyl-5-isopropyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2,5-diisopropyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-n-butyl-5-isopropyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-isobutyl-5-isopropyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-sec-butyl-5-isopropyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-tert-butyl-5-isopropyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(5-isopropyl-2,4-diphenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-methyl-5-n-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbisfl -(2-ethy 1-5 -n-butyl 4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-n-propyl-5-n-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-isopropyl-5-n-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-di-n-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-isobutyl-5-n-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-sec-butyl-5-n-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis[l-(2-tert-butyl-5-n-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis 1 -(5-n-butyl-2,4-diphenylindenyl)]zirconium dimethyl; dimethylsilanediylbis | l-(2-methyl-5-isobutyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis l-(2-ethyl-5-isobutyl 4-phenylindenyl)] zirconium dimethyl; dimethylsilanediylbis l-(2-n-propyl-5-isobutyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis l-(2-isopropyl-5-isobutyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis 1 -(2-n-butyl-5-isobutyl 4-phenylindenyl)] zirconium dimethyl; dimethylsilanediylbis 1 -(2,5-diisobutyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis l-(2-sec-butyl-5-isobutyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis | l-(2-tert-butyl-5-isobutyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis 1 -(5-isobutyl-2,4-diphenylindenyl)]zirconium dimethyl; dimethylsilanediylbis l-(2-methyl-5-sec-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis 1 -(2-ethy 1-5 -sec-butyl 4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis l-(2-n-propyl-5-sec-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis l-(2-isopropyl-5-sec-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis 1 -(2-n-buty 1-5 -sec-butyl 4-phenylindenyl)] zirconium dimethyl; dimethylsilanediylbis 1 -(2-isobuty 1-5 -sec-butyl-4-phenylindenyl)] zirconium dimethyl; dimethylsilanediylbis 1 -(2,5-di-sec-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [ 1 -(2-tert-butyl-5-sec-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [ 1 -(5-sec-butyl-2,4-diphenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [ 1 -(2-methyl-5-tert-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbisfl -(2-ethyl-5-tert-butyl 4-phenylindenyl)] zirconium dimethyl; dimethylsilanediylbisfl -(2-n-propyl-5-tert-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbisfl ■ (2-isopropyl-5-tert-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbisfl •(2-n-butyl-5-tert-butyl 4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbis [ 1 ■ (2-isobutyl-5-tert-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsilanediylbisfl ■ (2-sec-butyl-5-tert-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsillanediylbis ■(2,5-di-tert-butyl-4-phenylindenyl)]zirconium dimethyl; dimethylsillanediylbis ■ (5-tert-butyl-2,4-diphenylindenyl)]zirconium dimethyl; dimethylsillanediylbis ■ (2-methyl-4,5-diphenylindenyl)]zirconium dimethyl; dimethylsillanediylbis ■(2-ethyl-4,5-diphenylindenyl)]zirconium dimethyl; dimethylsill;anediylbis •(2-n-propyl-4,5-diphenylindenyl)]zirconium dimethyl; dimethylsil lanediylbis -(2-isopropyl-4,5-diphenylindenyl)]zirconium dimethyl; dimethylsil lanediylbis ■(2-n-butyl-4,5-diphenylindenyl)]zirconium dimethyl; dimethylsil lanediylbis ■(2-isobutyl-4,5-diphenylindenyl)]zirconium dimethyl; dimethylsillanediylbis ■(2-sec-butyl-4,5-diphenylindenyl)]zirconium dimethyl; dimethylsil lanediylbis ■ (2-tert-butyl-4,5-diphenylindenyl)]zirconium dimethyl; dimethylsill;anediylbis ■(2,4,5-triphenylindenyl)]zirconium dimethyl; dimethylsil lanediylbis [2,5-dimethyl-4-(2-methylphenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! 1 -[2-ethyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isopropyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-n-butyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isobutyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-sec-butyl-5-methyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-tert-butyl-5-methyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-phenyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2,5-dimethyl-4-(2,3-dimethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2,5-dimethyl-4-(2,4-dimethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2,5-dimethyl-4-(2,3 ,4-trimethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2,5-dimethyl-4-(2,3,5-trimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2,5-dimethyl-4-(2,3,4,5-tetramethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 2-methyl-5-ethyl-4-(2-methylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2,5-diethyl-4-(2-methylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-ethyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-isopropyl-5-ethyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { [2-n-butyl-5-ethyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! -[2-isobuty 1-5 -ethyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! [2-sec-butyl-5-ethyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { - [2-tert-butyl-5 -ethyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! ■ [2-phenyl-5 -ethyl-4-(2-methy lpheny l)indenyl] } zirconium dimethyl; dimethylsilanediylbis ! [2-methyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { -[2-ethyl-5-n-propyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! -f2,5-di-n-propyl-4-(2-methylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis ! -[2-isopropyl-5-n-propyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! •[2-n-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! -[2-isobutyl-5-n-propyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! ■f2-sec-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! ■[2-tert-butyl-5-n-propyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! -[2-phenyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { -[2-methyl-5-isopropyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! ■[2-ethyl-5-isopropyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 2-n-propyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2,5-diisopropyl-4-(2-methylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis ! 2-n-butyl-5-isopropyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-isobutyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-sec-butyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-tert-butyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-phenyl-5-isopropyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-methyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-ethyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-n-propyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-isopropyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-n-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 2-isobutyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-sec-butyl-5-tert-butyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2,5-di-tert-butyl-4-(2-methy lpheny l)indenyl] } zirconium dimethyl; dimethylsilanediylbis { 2-phenyl-5-tert-butyl-4-(2-methy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis [2-methyl-5-phenyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis [2-ethyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis [2-n-propyl-5-phenyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis [2-isopropyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis [2-n-butyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ■f2-isobutyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ■ f2-sec-butyl-5-phenyl-4-(2-methylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ■ [2-tert-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ■[2,5 -dipheny l-4-(2-methylphenyl)indeny 1] } zirconium dimethyl; dimethylsilanediylbis ■[2,5-dimethyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis ■[2-ethyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis ■[2-n-propyl-5-methyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ■f2-isopropyl-5-methyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ■[2-n-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis -[2-isobutyl-5-methyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ■[2-sec-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1 -[2-tert-butyl-5-methyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 1 -[2-pheny 1-5 -methyl-4-(2-ethy lpheny l)indenyl] } zirconium dimethyl; dimethylsilanediylbis 1 - [2 -methyl-5-ethyl-4-(2-ethy lpheny l)indenyl] } zirconium dimethyl; dimethylsilanediylbis l-[2,5-diethyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis l-[2-n-propyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 1 -[2-isopropyl-5-ethyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis l-[2-n-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis l-[2-isobutyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis l-[2-sec-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1 -[2-tert-butyl-5-ethyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 1 -[2-phenyl-5-ethyl-4-(2-ethylphenyl)indenyl] }zirconium dimethyl; dimethylsilanediylbis l-[2-methyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis l-[2-ethyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis l-[2,5-di-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 1 - [2-isopropyl-5 -n-propyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis l-[2-n-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; - 64 - dimethylsilanediylbis! 2-isobutyl-5-n-propyl-4-(2-ethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! 2-sec-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-tert-butyl-5-n-propyl-4-(2-ethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! 2-phenyl-5-n-propyl-4-(2-ethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2 -methyl-5-isopropyl-4-(2-ethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-ethy l-5-isopropyl-4-(2-ethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-n-propyl-5-isopropyl-4-(2-ethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2,5-diisopropyl-4-(2-ethylphenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis ! 2-n-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-isobutyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-sec-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-tert-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 2-phenyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-methyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-ethyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-n-propyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis{l-[2-isopropyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-isobuty 1-5 -tert-buty l-4-(2-ethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 1 - [2-sec-butyl-5 -tert-butyl-4-(2-ethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 1 - [2,5 -di-tert-butyl-4-(2-ethy lpheny l)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-tert-butyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-methyl-5-phenyl-4-(2-ethylphenyl)indenyl] }zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-ethyl-5 -phenyl-4-(2-ethylphenyl)indeny 1] } zirconium dimethyl; dimethylsilanediylbis!l-[2-n-propyl-5-phenyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 - [2-isopropyl-5-phenyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-phenyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-tert-butyl-5-phenyl-4-(2-ethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2,5-diphenyl-4-(2-ethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis ! 1 - [2,5 -dimethyl-4-(2-isopropy lpheny l)indeny 1] } zirconium dimethyl; dimethylsilanediylbis 2-ethyl-5-methyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isopropyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-n-butyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isobutyl-5-methyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-sec-butyl-5-methyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-tert-butyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-phenyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-methyl-5-ethyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2,5-diethyl-4-(2-isopropylphenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 2-isopropyl-5-ethyl-4-(2-isopropylρhenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-n-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isobutyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-sec-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 2-tert-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-phenyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-methyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-ethyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2,5-di-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-isopropyl-5-n-propyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-n-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-isobutyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-sec-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-tert-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-phenyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-methyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 2-ethyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-n-propyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 2,5-diisopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 2-n-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 2-isobutyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 1- 2-sec-butyl-5-isopropyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-tert-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 1- 2-phenyl-5-isopropyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-methyl-5-tert-butyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 1- 2-ethy l-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isopropyl-5 -tert-buty l-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-n-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 1- 2-isobutyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 2-sec-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2,5-di-tert-butyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-phenyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-methy 1-5 -phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-ethy l-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isopropyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! 1 -[2-n-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl] }- zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 -[2-tert-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2,5-diphenyl-4-(2-isopropylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis! l-[2,5-dimethyl-4-(2-biphenylyl)indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-n-propyl-5 -methyl-4-(2-biphenylyl) indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-methyl-4-(2-biphenylyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-butyl-5-methyl-4-(2-biphenylyl)indenyl] }zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-isobutyl-5 -methyl-4-(2-biρhenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-sec-butyl-5 -methyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-methyl-4-(2-biphenylyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 - [2-phenyl-5 -methyl-4-(2-biphenylyl)indeny 1] } zirconium dimethyl; dimethylsilanediylbis{l-[2-methyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis{l-[2,5-diethyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-isopropyl-5-ethyl-4-(2-biphenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis 2-n-buty 1-5 -ethyl-4-(2-biphenylyl)indeny 1] } zirconium dimethyl; dimethylsilanediylbis 2-isobutyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-sec-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-tert-butyl-5-ethyl-4-(2-biphenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis 2-phenyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-methyl-5-n-propyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-ethyl-5-n-propyl-4-(2-biphenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis 2,5-di-n-propyl-4-(2-biphenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis 2-isopropyl-5-n-propyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-n-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 2-isobutyl-5-n-propyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-sec-butyl-5 -n-propyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-tert-butyl-5-n-propyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-phenyl-5-n-propyl-4-(2-biphenylyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1- 2-methyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-ethyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2,5-diisopropyl-4-(2-biphenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis 2-n-butyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isobutyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-sec-butyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-tert-butyl-5 -isopropyl-4-(2-bipheny ly l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-phenyl-5-isopropyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-methyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-ethyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis 2-n-propyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isopropyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 2-n-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 2-isobutyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1- 2-sec-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! 1 - 2,5-di-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis { 1 - 2-phenyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! 1- 2-methyl-5-phenyl-4-(2-biphenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! 1 - 2-ethyl-5-phenyl-4-(2-biphenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis { 1 - 2-n-propyl-5-phenyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! 1- 2-isopropyl-5-phenyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 1 - 2-n-butyl-5-phenyl-4-(2-biphenylyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! 1 - 2-isobutyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis { 1 - 2-sec-butyl-5 -phenyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 1 - 2-tert-butyl-5-phenyl-4-(2-biphenylyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! 1 - 2,5-diphenyl-4-(2-biphenylyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis { 1 - 2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis! 1 - 2-ethyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! 1 - [2-n-propyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 - 2-isopropyl-5-methyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 1 - 2-n-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1 -[2-isobutyl-5-methyl-4-(3,5-dimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis l-[2-sec-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis l-[2-tert-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1 - [2-pheny 1-5 -methy l-4-(3 ,5 -dimethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 1 -[2-methyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl] }- zirconium dimethyl; dimethylsilanediylbis 1 -[2,5-diethyl-4-(3,5-dimethylphenyl)indenyl] }zirconium dimethyl; dimethylsilanediylbis l-[2-n-propyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1 -[2-isopropyl-5-ethyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis 1 -[2-n-butyl-5-ethyl-4-(3 ,5 -dimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis l-[2-isobutyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis l-[2-sec-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1 - [2-tert-butyl-5 -ethyl-4-(3 ,5 -dimethylpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis l-[2-phenyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis l-[2-methyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis l-[2-ethyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis 1 -[2,5-di-n-propyl-4-(3 ,5 -dimethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis!l-[2-isopropyl-5-n-propyl-4-(3,5-dimethylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-butyl-5-n-propyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-isobutyl-5-n-propy l-4-(3 , 5 -dimethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-n-propyl-4-(3, 5 -dimethy lpheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-tert-butyl-5-n-propyl-4-(3 ,5-dimethylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]|- zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2 -n-propyl-5-isopropyl-4-(3, 5-dimethylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 - [2,5-diisopropyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-n-butyl-5-isopropyl-4-(3 ,5 -dimethy lphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-isobutyl-5-isopropyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-sec-butyl-5 -isopropy l-4-(3 ,5 -dimethylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! 1 -[2-tert-butyl-5-isopropyl-4-(3 ,5-dimethylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-phenyl-5-isopropyl-4-(3 ,5 -dimethy lpheny l)indenyl] }- zirconium dimethyl; dimethylsilanediylbis!l-[2-methyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis{l-[2-ethyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2 -n-propyl-5-tert-butyl-4-(3,5-dimethylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-isopropyl-5-tert-butyl-4-(3 ,5-dimethylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-butyl-5-tert-butyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-isobutyl-5 -tert-butyl-4-(3 ,5 -dimethy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-tert-butyl-4-(3, 5-dimethylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-di-tert-butyl-4-(3,5-dimethylphenyl)indenyl] }- zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! 1 -[2-isopropyl-5-phenyl-4-(3 ,5-dimethylphenyl)indenyl] }- zirconium dimethyl; dimethylsilanediylbis!l-[2-n-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis!l-[2-sec-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis!l-[2-tert-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis!l-[2,5-diphenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dimethyl; dimethylsilanediylbis! l-[2,5-dimethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-methyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-propyl-5-methyl-4-(3 ,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-methyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-methyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-methyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2,5-diethyl-4-(3 ,5-bis-trifluoromethyl-phenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis!l-[2-sec-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2 -tert-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-n-propyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-di-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-n-propyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-isobutyl-5-n-propyl-4-(3 ,5 -bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis { 1 -[2-tert-butyl-5-n-propyl-4-(3 ,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis { 1 - [2-pheny l-5-n-propyl-4-(3 , 5 -bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-methyl-5 -isopropyl-4-(3 , 5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis { 1 - [2-ethy 1-5 -isopropyl-4-(3 ,5 -bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2,5-diisopropyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis{l-[2-n-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis { 1 -[2-isobutyl-5-isopropyl-4-(3.5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-isopropyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 - [2-methy 1-5 -tert-butyl-4-(3 , 5 -bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-isopropyl-5-tert-butyl-4-(3 ,5-bis-trifluoromethyl- phenyl)indenyl] }zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 - [2-isobutyl-5-tert-butyl-4-(3 , 5 -bis-trifluoromethy 1- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis{l-[2,5-di-tert-butyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } -zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] }zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis!l-[2-n-propyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-phenyl-4-(3,5-bis-trifluoromethyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-phenyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2,5-diphenyl-4-(3 ,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-dimethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-n-propyl-5 -methyl-4-(3 ,5 -bis-trimethylsilyl-pheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis{l-[2-isobutyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis!l-[2-phenyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-methyl-5-ethyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2,5-diethyl-4-(3 ,5-bis-trimethylsilyl-phenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-n-butyl-5 -ethyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dimethyl ; dimethylsilanediylbis { 1 -[2-isobutyl-5-ethyl-4-(3 ,5-bis-trirnethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-sec-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-tert-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2 -phenyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-methy 1-5 -n-propyl-4-(3 ,5 -bis-trimethy lsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-di-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-isopropyl-5-n-propyl-4-(3 ,5-bis-trimethylsilyl- phenyl)indenyl] }zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-butyl-5-n-propyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] }zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-n-propyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis!l-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2 -phenyl-5-n-propyl-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2 -methyl-5-isopropyl-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-propyl-5-isopropyl-4-(3 ,5-bis-trimethylsilyl- phenyl)indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-diisopropyl-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis!l-[2-sec-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl- phenyl)indenyl] } zirconium dimethyl ; dimethylsilanediylbis! l-[2-phenyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]}zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-ρhenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl- phenyl)indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-n-butyl-5-tert-butyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-isobutyl-5-tert-butyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl- phenyl)indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2,5-di-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-n-butyl-5 -phenyl-4-(3 ,5 -bis-trimethylsilyl-pheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis!l-[2-isobutyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis!l-[2-sec-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2,5-diphenyl-4-(3 ,5-bis-trimethylsilyl-phenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 1 -[2,5-dimethyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 -[2-n-propyl-5-methyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis{l-[2-isopropyl-5-methyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-methyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-methyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-pheny 1-5 -methyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 -[2,5-diethyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-n-butyl-5 -ethyl-4-(3 , 5 -diisopropy lphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-isobutyl-5-ethyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-pheny 1-5 -ethyl-4-(3 ,5 -diisopropy lpheny l)indeny 1] } - zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-methyl-5 -n-propyl-4-(3 ,5 -diisopropy lpheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-ethyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2,5-di-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-isopropyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-butyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-n-propyl-4-(3,5-diisopropylphenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-tert-butyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis {1 -[2-pheny l-5-n-propyl-4-(3, 5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-methyl-5 -isopropyl-4-(3 ,5 -diisopropy lpheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-ethy l-5-isopropyl-4-(3 ,5 -diisopropylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2 -n-propyl-5-isopropyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-diisopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-butyl-5-isopropyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-isobutyl-5 -isopropyl-4-(3 ,5 -diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis{l-[2-phenyl-5-isopropyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-isopropyl-5-tert-butyl-4-(3 ,5-diisopropylphenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-tert-butyl-4-(3, 5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-isobutyl-5 -tert-buty l-4-(3 ,5 -diisopropy lpheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-sec-butyl-5-tert-butyl-4-(3 , 5 -diisopropy lpheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-di-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-tert-butyl-4-(3,5-diisopropylphenyl)- indenyl] }zirconium dimethyl; ' dimethylsilanediylbis ! 1 - [2-methy l-5-phenyl-4-(3 ,5-diisopropy lpheny l)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-n-propyl-5-phenyl-4-(3 ,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-phenyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis{l-[2-isobutyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis{l-[2-sec-butyl-5-phenyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2 -tert-butyl-5-phenyl-4-(3, 5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-diphenyl-4-(3,5-diisopropylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylb iis { 1 -[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylb iis{l-[2-ethyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 - [2-n-propyl-5-methyl-4-(3 , 5 -di-tert-buty lphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-methyl-4-(3, 5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-methyl-4-(3, 5 -di-tert-buty lphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-methyl-4-(3, 5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 -[2,5-diethyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis { 1 -[2-n-propyl-5-ethyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis!l-[2-isopropyl-5-ethyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethy lsilanediylbis { 1 - [2-n-butyl-5-ethyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 - [2-sec-butyl-5-ethyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis { 1 -[2-methyl-5-n-propyl-4-(3 , 5 -di-tert-buty lpheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-ethyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2,5-di-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-n-butyl-5 -n-propy l-4-(3 , 5 -di-tert-buty lpheny 1)- indenyl] } zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-isobutyl-5-n-propyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-sec-butyl-5-n-propyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5 -n-propy l-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 - [2-pheny 1-5-n-propy l-4-(3 , 5 -di-tert-buty lpheny 1)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-methyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-ethyl-5-isopropyl-4-(3 ,5 -di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 - [2, 5 -diisopropy l-4-(3 , 5 -di-tert- buty lpheny l)indenyl] } zirconium dimethyl; dimethylsilanediylbis! 1 -[2-n-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2 -isobutyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl] } zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-tert-butyl-5-isopropyl-4-(3 ,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-phenyl-5-isopropyl-4-(3, 5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-methyl-5 -tert-buty l-4-(3 ,5 -di-tert-buty lphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-ethyl-5-tert-butyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-tert-butyl-4-(3, 5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-n-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-sec-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis!l-[2,5-di-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl] }zirconium dimethyl; dimethylsilanediylbis!l-[2-phenyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis { 1 -[2-methy 1-5 -phenyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis ! 1 -[2-ethyl-5-phenyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dimethyl; dimethylsilanediylbis! l-[2-n-propyl-5-phenyl-4-(3, 5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-isopropyl-5-phenyl-4-(3,5-di-tert-butylphenyl)- indenyl] } zirconium dimethyl ; dimethylsilanediylbis! l-[2-n-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; dimethylsilanediylbis! l-[2-isobutyl-5-phenyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis ! 1 - [2-sec-butyl-5 -phenyl-4-(3 ,5 -di-tert-buty lpheny 1)~ indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2-tert-butyl-5-phenyl-4-(3, 5-di-tert-butylphenyl)- indenyl]} zirconium dimethyl; dimethylsilanediylbis! l-[2,5-diphenyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dimethyl; 9-silafluorenediyl[l-(2,5-dimethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l -(2-ethyl-5-methyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-n-propyl-5-methyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 -(2-isopropyl-5 -methyl-4-pheny lindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-n-butyl-5-methyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [1 -(2-isobutyl-5-methyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-sec-butyl-5-methyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-tert-butyl-5-methyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 -(5-methyl-2,4-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 -(2-trifluoromethyl-5-methyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-trimethylsilyl-5-methyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-methyl-5-trifluoromethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-methyl-5-trimethylsilyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2,5,6-trimethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-methyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 -(2, 5 -diethyl-4-phenylindenyl)] zirconium dichloride; 9-silafluorenediyl[l -(2-n-propyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-isopropyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-n-butyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-isobutyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-sec-butyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-tert-butyl-5-ethyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 -(5 -ethyl-2,4-diphenylindenyl)] zirconium dichloride; 9-silafluorenediyl[l-(2-methyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l -(2-ethyl-5-n-propyl 4-phenylindenyl)] zirconium dichloride; 9-silafluorenediyl[l-(2,5-di-n-propyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 -(2-isopropyl-5 -n-propy 1-4-phenylindeny 1)] zirconium dichloride; 9-silafluorenediyl[l-(2-n-butyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-isobutyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-sec-butyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-tert-butyl-5-n-propyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [1 -(5-n-propyl-2,4-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-methyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediy 1 [ 1 - 2-ethyl-5-isopropyl 4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l ■ 2-n-propyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 ■ 2,5-diisopropyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l- 2-n-butyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [1 • 2-isobutyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 ■ 2-sec-butyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l • 2-tert-butyl-5-isopropyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [1 ■ 5-isopropyl-2,4-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 • 2-methyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 ■ 2-ethy 1-5 -n-butyl 4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 ■ 2-n-propyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [1 ■ 2-isopropyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l 2-di-n-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 2-isobutyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l 2-sec-butyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 2-tert-butyl-5-n-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 5-n-butyl-2,4-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 (2-methyl-5-isobutyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 2-ethyl-5-isobutyl 4-phenylindenyl)] zirconium dichloride; 9-silafluorenediyl [ 1 2-n-propyl-5-isobutyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 (2-isopropyl-5-isobutyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl •(2-n-butyl-5 -isobutyl 4-phenylindenyl)] zirconium dichloride; 9-silafluorenediyl I -(2,5 -diisobuty 1-4-phenylindenyl)] zirconium dichloride; 9-silafluorenediyl | ■(2-sec-butyl-5-isobutyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl •(2-tert-buty 1-5 -isobutyl-4-pheny lindenyl)] zirconium dichloride; 9-silafluorenediyl •(5 -isobutyl-2,4-diphenylindenyl)] zirconium dichloride; 9-silafluorenediyl -(2-methyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-ethyl-5-sec-butyl 4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-n-propyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-isopropyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl ■(2-n-butyl-5-sec-butyl 4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-isobutyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2,5-di-sec-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-tert-butyl-5-sec-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(5-sec-butyl-2,4-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-methyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-ethyl-5 -tert-butyl 4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-n-propyl-5 -tert-buty 1-4-phenylindenyl)] zirconium dichloride; 9-silafluorenediyl -(2-isopropyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl -(2-n-butyl-5 -tert-butyl 4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-isobutyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [ 1 -(2-sec-butyl-5-tert-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl [1 -(2,5-di-tert-butyl-4-phenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(5-tert-butyl-2,4-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-methyl-4,5-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-ethyl-4,5-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-n-propyl-4,5-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l -(2-isopropyl-4, 5 -diphenylindenyl)] zirconium dichloride; 9-silafluorenediyl[l-(2-n-butyl-4,5-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-isobutyl-4,5-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-sec-butyl-4,5-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl[l-(2-tert-butyl-4,5-diphenylindenyl)]zirconium dichloride; 9-silafluorenediyl [1 -(2,4,5-triphenylindenyl)]zirconium dichloride; 9-silafluorenediyl! l-[2,5-dimethyl-4-(2-methylphenyl)indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{ l-[2-n-propyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isopropyl-5 -methyl-4-(2-methylphenyl)indeny 1] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-butyl-5-methyl-4-(2-methylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl!l-[2-sec-butyl-5-methyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5-methyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-phenyl-5-methyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2,5-dimethyl-4-(2,3-dimethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{l-[2,5-dimethyl-4-(2,4-dimethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - [2,5-dimethyl-4-(2,3 ,4-trimethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2,5-dimethyl-4-(2,3,5-trimethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-dimethyl-4-(2,3 ,4,5-tetramethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-methyl-5-ethyl-4-(2-methylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - [2,5 -diethyl-4-(2-methy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-propyl-5-ethyl-4-(2-methylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - [2-isopropyl-5-ethyl-4-(2-methylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 -[2-n-butyl-5-ethyl-4-(2-methylphenyl)indenyl] }zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isobutyl-5 -ethy l-4-(2-methy lpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5 -ethy l-4-(2-methy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - [2-tert-butyl-5 -ethy l-4-(2-methy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2-pheny 1-5 -ethy l-4-(2-methy lpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl { 1 - [2-methy 1-5 -n-propy l-4-(2-methy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-ethyl-5-n-propyl-4-(2-methy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2,5-di-n-propyl-4-(2-methylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-isopropyl-5-n-propyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-n-butyl-5 -n-propy l-4-(2-methy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-isobutyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-sec-butyl-5-n-propyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-tert-butyl-5-n-propyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-phenyl-5-n-propyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-methyl-5-isopropyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-ethyl-5 -isopropyl-4-(2-methy lpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-n-propyl-5-isopropyl-4-(2-methy lpheny l)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2,5-diisopropyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1 - 2-n-butyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-isobutyl-5-isopropyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl! 1 - 2-sec-butyl-5-isopropyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-tert-butyl-5-isopropyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-pheny 1-5 -isopropyl-4-(2-methy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-methyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-isopropyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-tert-butyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isobutyl-5-tert-butyl-4-(2-methylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5 -tert-buty l-4-(2-methy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-di-tert-butyl-4-(2-methylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2-pheny 1-5 -tert-buty l-4-(2-methy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-methy 1-5 -phenyl-4-(2-methy lpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl{l-[2-ethyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{l-[2-n-propyl-5-phenyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{l-[2-isopropyl-5-phenyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-butyl-5-phenyl-4-(2-methylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - [2-isobuty 1-5 -pheny l-4-(2-methy lpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl! ] 2-sec-butyl-5-phenyl-4-(2-methy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! ] 2-tert-butyl-5-phenyl-4-(2-methylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! 1 2,5-diphenyl-4-(2-methylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1 2,5-dimethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! ] 2-ethyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 2-n-propyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! ] 2-isopropyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! ] 2-n-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! ] 2-isobutyl-5-methyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! ] 2-sec-butyl-5-methyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! ] 2-tert-butyl-5-methyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! ] 2-phenyl-5-methyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1 2-methy 1-5 -ethyl-4-(2-ethy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1 2,5-diethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1 2-n-propyl-5-ethyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1 -[2-isopropyl-5-ethyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-n-butyl-5 -ethyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-isobutyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-sec-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1 - 2-tert-butyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-phenyl-5-ethyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-methyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-ethyl-5-n-propyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2,5-di-n-propyl-4-(2-ethy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-isopropyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride: 9-silafluorenediyl { 1 - 2-n-butyl-5 -n-propyl-4-(2-ethy lpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl! 1 - 2-isobuty l-5-n-propyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-sec-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-tert-butyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - 2-phenyl-5-n-propyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-methyl-5-isopropyl-4-(2-ethylρhenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-ethyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-n-propyl-5-isopropyl-4-(2-ethy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl! 1 - 2,5-diisopropyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1 - 2-n-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1 - 2-isobutyl-5-isopropyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-sec-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-tert-butyl-5-isopropyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-pheny 1-5 -isopropy l-4-(2-ethy lpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl ! 1 - 2-methy 1-5 -tert-butyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1 - 2-ethyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1 - 2-n-propyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl! 1 - 2-isopropyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl ! 1 - 2-n-butyl-5-tert-butyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-isobuty 1-5 -tert-buty l-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-sec-butyl-5 -tert-buty l-4-(2-ethy lpheny l)indenyl] } - zirconium dichloride 9-silafluorenediyl! 1 - 2,5-di-tert-butyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 - [2-pheny 1-5 -tert-buty l-4-(2-ethy lpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl ! 1 -[2-methyl-5-phenyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1 -[2-ethyl-5-phenyl-4-(2-ethylphenyl)indenyl] }zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isopropyl-5-phenyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1 -[2-isobutyl-5-phenyl-4-(2-ethylphenyl)indenyl] }zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-phenyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5 -phenyl-4-(2-ethylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2,5-diphenyl-4-(2-ethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - [2,5-dimethyl-4-(2-isopropylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - [2-ethy 1-5 -methyl-4-(2-isopropy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-methyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-methyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl!l-[2-n-butyl-5-methyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl!l-[2-isobutyl-5-methyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! 1 -[2-sec-butyl-5-methyl-4-(2-isopropylphenyl)indenyl] }- zirconium dichloride; 9-silafluorenediyl { 1 - 2-tert-butyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-phenyl-5-methyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-methy 1-5 -ethy l-4-(2-isopropylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2,5-diethyl-4-(2-isopropylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1- 2-n-propyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-isopropyl-5-ethyl-4-(2-isoproρylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-n-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-isobuty 1-5 -ethy l-4-(2-isopropylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-sec-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride: 9-silafluorenediyl { 1 - 2-tert-butyl-5-ethyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1- 2-phenyl-5-ethyl-4-(2-isopropylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-methyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - 2-ethyl-5 -n-propy l-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2,5-di-n-propyl-4-(2-isopropylphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-isopropyl-5 -n-propy l-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - 2-n-butyl-5-n-propyl-4-(2-isopropylρhenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - [2-isobutyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 -[2-sec-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-tert-butyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-phenyl-5-n-propyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-methyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-ethyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2,5-diisopropyl-4-(2-isopropylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! 1 -[2-isobutyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-tert-butyl-5-isopropyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 -[2-phenyl-5-isopropyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-methyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{ l-[2-isopropyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-n-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-isobutyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 -[2-sec-butyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2,5-di-tert-butyl-4-(2-isopropylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{l-[2-phenyl-5-tert-butyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-methyl-5-phenyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-ethy 1-5 -phenyl-4-(2-isopropy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-propyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-isopropyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 -[2-n-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-phenyl-4-(2-isopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-sec-butyl-5-phenyl-4-(2-isopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5 -phenyl-4-(2-isopropy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl!l-[2,5-diphenyl-4-(2-isopropylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{l-[2,5-dimethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl 2-ethyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl 2-n-propyl-5 -methyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl 2-isopropyl-5 -methy l-4-(2-bipheny lyl)indeny 1] } zirconium dichloride; 9-silafluorenediyl 2-n-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl 2-isobutyl-5-methyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl 2-sec-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl 2-tert-butyl-5-methyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl 2-phenyl-5-methyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl 2-methyl-5 -ethyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl 2,5-diethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl 2-n-proρyl-5-ethyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl 2-isopropyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl 2-n-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl 2-isobuty 1-5 -ethyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl 2-sec-butyl-5-ethyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl 1- 2-tert-butyl-5-ethyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 -[2-phenyl-5-ethyl-4-(2-biphenylyl)indenyl] }zirconium dichloride; 9-silafluorenediyl ! 1 - [2-methyl-5-n-propyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2,5-di-n-propyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 -[2-isopropyl-5-n-propyl-4-(2-biphenylyl)indenyl] }zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 -[2-sec-butyl-5-n-propyl-4-(2-biphenylyl)indenyl] }zirconium dichloride; 9-silafluorenediyl! l-[2-tert-butyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-phenyl-5-n-propyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-methyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethyl-5-isopropyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2,5-diisopropyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-isopropyl-4-(2-biρhenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-sec-butyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1 - 2-tert-butyl-5 -isopropyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-phenyl-5-isopropyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1 - 2-methyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 1 2-ethyl-5 -tert-butyl-4-(2-biphenylyl)indeny 1] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-n-propyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! 1 - 2-isopropyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1- 2-n-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-isobutyl-5 -tert-buty l-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-sec-butyl-5-tert-butyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2,5-di-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-phenyl-5-tert-butyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-methyl-5 -pheny l-4-(2-biphenylyl)indeny 1] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-ethyl-5 -pheny l-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - 2-n-propyl-5 -phenyl-4-(2-bipheny lyl)indenyl] } zirconium dichloride; 9-silafluorenediyl! 1- 2-isopropy 1-5 -phenyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl{l-[2-n-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isobuty l-5-phenyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5-phenyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl{l-[2-tert-butyl-5-phenyl-4-(2-biphenylyl)indenyl]}zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-diphenyl-4-(2-biphenylyl)indenyl] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-dimethyl-4-(3 ,5-dimethy lphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 - [2-ethyl-5-methyl-4-(3 ,5-dimethy lphenyl)indenyl] } zirconium dichloride; 9-silafluorenediyl{l-[2-n-propyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-isopropyl-5-methyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! 1 -[2-n-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl] }- zirconium dichloride; 9-silafluorenediyl{l-[2-isobutyl-5-methyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 -[2-sec-butyl-5-methyl-4-(3,5-dimethylphenyl)indenyl] }- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5 -methy l-4-(3 , 5 -dimethy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-phenyl-5 -methy l-4-(3 ,5 -dimethy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl! 1 -[2-methyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl] }zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-diethyl-4-(3 ,5-dimethylphenyl)indenyl] }zirconium dichloride; 9-silafluorenediyl!l-[2-n-propyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isopropyl-5-ethyl-4-(3 ,5-dimethy lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-n-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-isobuty l-5-ethyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5-ethyl-4-(3 ,5-dimethy lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-tert-butyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-phenyl-5-ethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - [2-methyl-5-n-propyl-4-(3 , 5 -dimethy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethy 1-5 -n-propyl-4-(3 ,5 -dimethy lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2,5-di-n-propyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-isobutyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl!l-[2-sec-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-tert-butyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-phenyl-5-n-propyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-methyl-5-isopropyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-propyl-5-isopropyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2, 5 -diisopropyl-4-(3 , 5 -dimethylpheny l)indeny 1] } zirconium dichloride; 9-silafluorenediyl { 1 -[2-n-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-isobutyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-tert-butyl-5-isopropyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-phenyl-5 -isopropyl-4-(3 , 5 -dimethy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-methy 1-5 -tert-butyl-4-(3 ,5 -dimethylpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethy 1-5-tert-buty l-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-propyl-5-tert-butyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-sec-butyl-5 -tert-buty l-4-(3 ,5 -dimethylpheny l)indeny 1] } - zirconium dichloride; 9-silafluorenediyl!l-[2,5-di-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{l-[2-phenyl-5-tert-butyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-methy l-5-phenyl-4-(3 ,5 -dimethy lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethyl-5-phenyl-4-(3 ,5-dimethy lpheny l)indenyl] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-propyl-5-phenyl-4-(3 ,5-dimethylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-butyl-5-phenyl-4-(3 ,5-dimethy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-phenyl-4-(3,5-dimethylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5 -pheny l-4-(3 ,5 -dimethy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2,5-diphenyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{l-[2,5-dimethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 -[2-ethyl-5-methyl-4-(3 ,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-propyl-5 -methy l-4-(3 ,5 -bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl!l-[2-isopropyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-n-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 - [2-isobutyl-5-methyl-4-(3 ,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! 1 -[2-tert-butyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-phenyl-5-methyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-methyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2,5-diethyl-4-(3,5-bis-trifluoromethyl-phenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-n-propyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-buty 1-5 -ethyl-4-(3 ,5 -bis-trifluoromethy 1-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5-ethyl-4-(3 ,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-tert-butyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! 1 -[2-phenyl-5-ethyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-methyl-5 -n-propy l-4-(3 , 5 -bis-trifluoromethy 1-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl!l-[2-ethyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-di-n-propyl-4-(3 ,5-bis-trifluoromethyl-phenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{ l-[2-isopropyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{ l-[2-isobutyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{ l-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 -[2-tert-butyl-5-n-propyl-4-(3 ,5 -bis-trifluoromethyl-pheny 1)- indenyl] } zirconium dichloride; 9-silafluorenediyl{ l-[2-phenyl-5-n-propyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-methyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-propyl-5 -isopropy l-4-(3 ,5 -bis-trifluoromethy 1-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 -[2,5-diisopropyl-4-(3 ,5 -bis-trifluoromethyl-pheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isobuty l-5-isopropyl-4-(3 ,5 -bis-trifluoromethy 1-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5 -isopropy l-4-(3 , 5 -bis-trifluoromethy 1-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5 -isopropy l-4-(3 ,5 -bis-trifluoromethyl-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-phenyl-5-isopropyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] } zirconium dichloride; 9-silafluorenediyl{ l-[2-methyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-propyl-5-tert-butyl-4-(3 ,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2 -n-butyl-5-tert-butyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2,5-di-tert-butyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 - [2-phenyl-5 -tert-butyl-4-(3 , 5 -bis-trifluoromethyl-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-methyl-5-phenyl-4-(3, 5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-isopropyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-butyl-5-phenyl-4-(3 ,5 -bis-trifluoromethy 1-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5-phenyl-4-(3 ,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-tert-butyl-5-phenyl-4-(3,5-bis-trifluoromethyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 -[2,5-diphenyl-4-(3 ,5-bis-trifluoromethyl-phenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2,5-dimethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethyl-5-methyl-4-(3 ,5-bis-trimethylsilyl-phenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2 -sec-butyl-5-methyl-4-(3, 5 -bis-trimethy lsily 1-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl!l-[2-tert-butyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-phenyl-5-methyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] } zirconium dichloride; 9-silafluorenediyl{l-[2-methyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2,5-diethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl!l-[2-isopropyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl!l-[2-n-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl] }zirconium dichloride; 9-silafluorenediyl!l-[2-isobutyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-sec-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-tert-butyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-phenyl-5-ethyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl!l-[2-methyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethy 1-5 -n-propy l-4-(3 ,5 -bis-trimethylsily 1-pheny 1)- indenyl] } zirconium dichloride; 9-silafluorenediyl! l-[2,5-di-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! 1 - [2-isopropy 1-5 -n-propy l-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl!l-[2-n-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-n-propyl-4-(3, 5 -bis-trimethylsilyl-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-sec-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-tert-butyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-phenyl-5-n-propyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! 1 -[2-methyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-propyl-5-isopropyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2,5-diisopropyl-4-(3,5-bis-trimethylsilyl-phenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl!l-[2-n-butyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-isobutyl-5-isopropyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-isopropyl-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5-isopropyl-4-(3 ,5 -bis-trimethylsilyl-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl { 1 - [2 -pheny 1-5 -isopropy l-4-(3 ,5-bis-trimethylsily 1-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-methyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-ethyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-propyl-5-tert-butyl-4-(3 ,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-tert-butyl-4-(3, 5 -bis-trimethylsilyl-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-tert-butyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-di-tert-butyl-4-(3 ,5-bis-trimethylsily l-phenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-pheny 1-5 -tert-butyl-4-(3 ,5 -bis-trimethylsilyl-pheny 1)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2-methyl-5-phenyl-4-(3 ,5-bis-trimethylsily 1-phenyl)- indenyl] }zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethyl-5-phenyl-4-(3 ,5-bis-trimethylsilyl-phenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-n-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-isobutyl-5-phenyl-4-(3, 5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-tert-butyl-5-phenyl-4-(3,5-bis-trimethylsilyl-phenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-diphenyl-4-(3 ,5-bis-trimethylsilyl-phenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2, 5 -dimethy l-4-(3 ,5 -diisopropy lphenyl)indeny 1] } zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethyl-5 -methy l-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-propyl-5-methyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-isopropyl-5-methyl-4-(3,5-diisopropylphenyl)-indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-butyl-5-methyl-4-(3 ,5-diisopropy lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl!l-[2-isobutyl-5-methyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5-methyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5-methyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-pheny 1-5 -methy l-4-(3 ,5 -diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - 2-methyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- irconium dichloride; 9-silafluorenediyl ! 1 - 2,5-diethyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl { 1 - 2-n-propyl-5 -ethyl-4-(3 ,5 -diisopropy lpheny l)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-isopropyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl! 1 - 2-n-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl ! 1 - 2-isobutyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl ! 1 - 2-sec-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride: 9-silafluorenediyl { 1 - 2-tert-butyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-phenyl-5-ethyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl! 1- 2-methyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl ! 1 - 2-ethyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl ! 1 - 2,5-di-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-isopropyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl ! 1 - 2-n-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl ! 1 - 2-isobutyl-5-n-propyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl ! 1 - 2-sec-butyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - [2-tert-butyl-5 -n-propyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - 2-phenyl-5-n-propyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-methyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-ethyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl ! 1 - 2-n-propy 1-5 -isopropy l-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2,5-diisopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-n-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-isobutyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-sec-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-tert-butyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-phenyl-5-isopropyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1- 2-methyl-5 -tert-buty l-4-(3 ,5 -diisopropy lpheny l)indenyl] } - zirconium dichloride 9-silafluorenediyl! 1 - 2-ethyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-n-propyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-isopropyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-n-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl{l-[2-isobutyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-sec-butyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 -[2,5-di-tert-butyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-phenyl-5-tert-butyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-methyl-5-phenyl-4-(3 ,5 -diisopropy lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! 1 -[2-ethyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-propyl-5-phenyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-phenyl-4-(3,5-diisopropylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-butyl-5 -pheny l-4-(3 , 5 -diisopropy lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isobutyl-5-phenyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! 1 - [2-sec-butyl-5-phenyl-4-(3 ,5-diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-tert-butyl-5 -pheny l-4-(3 ,5 -diisopropylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2,5-diphenyl-4-(3,5-diisopropylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl{l-[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl!l-[2-ethyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 -[2-n-propyl-5-methyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-isopropyl-5-methyl-4-(3 ,5-di-tert-buty lpheny l)-indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-n-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl{l-[2-isobutyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-sec-butyl-5-methyl-4-(3 ,5-di-tert-buty lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-tert-butyl-5-methyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-phenyl-5 -methyl-4-(3 ,5 -di-tert-butylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-methyl-5-ethyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2,5-diethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium dichloride; 9-silafluorenediyl! l-[2-n-propyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-n-buty 1-5 -ethyl-4-(3 ,5 -di-tert-buty lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-isobutyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-sec-butyl-5-ethyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-tert-butyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl!l-[2-phenyl-5-ethyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-methyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - 2-ethy 1-5 -n-propy l-4-(3 , 5 -di-tert-buty lpheny l)indeny 1] } - zirconium dichloride 9-silafluorenediyl { 1 - 2,5 -di-n-propy l-4-(3 , 5 -di-tert-buty lpheny l)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-isopropyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-n-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride: 9-silafluorenediyl { 1 - 2-isobutyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-sec-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-tert-butyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-phenyl-5-n-propyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-methyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-ethyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2-n-propyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride 9-silafluorenediyl { 1 - 2,5-diisopropyl-4-(3 ,5 -di-tert-buty lpheny l)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-n-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride: 9-silafluorenediyl { 1- 2-isobuty 1-5 -isopropy l-4-(3 ,5 -di-tert-buty lpheny l)indenyl] } - zirconium dichloride 9-silafluorenediyl { 1 - 2-sec-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl] } zirconium dichloride; 9-silafluorenediyl { 1 2-tert-butyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)- indenyl] } zirconium dichloride; 9-silafluorenediyl{l-[2-phenyl-5-isopropyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-methyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-ethyl-5-tert-butyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 -[2-n-propyl-5-tert-butyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl{l-[2-isopropyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl{l-[2-n-butyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-isobutyl-5-tert-butyl-4-(3 ,5-di-tert-buty lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! 1 -[2-sec-butyl-5-tert-butyl-4-(3, 5-di -tert-butylphenyl)- indenyl]} zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-di-tert-butyl-4-(3 ,5-di-tert-buty lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-phenyl-5-tert-butyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl ! 1 - [2-methy 1-5 -phenyl-4-(3 ,5 -di-tert-butylphenyl)indeny 1] } - zirconium dichloride; 9-silafluorenediyl ! 1 -[2-ethyl-5-phenyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2-n-propyl-5-phenyl-4-(3 ,5-di-tert-buty lρhenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl! l-[2-isopropyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl! l-[2-n-butyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl!l-[2-isobutyl-5-phenyl-4-(3,5-di-tert-butylphenyl)indenyl]}- zirconium dichloride; 9-silafluorenediyl { 1 - [2-sec-butyl-5-phenyl-4-(3 ,5-di-tert-buty lphenyl)indenyl] } - zirconium dichloride; 9-silafluorenediyl { 1 - [2-tert-butyl-5-phenyl-4-(3 ,5-di-tert-buty lpheny l)indenyl] } - zirconium dichloride; 9-silafluorenediyl ! 1 - [2,5-diphenyl-4-(3 ,5-di-tert-butylphenyl)indenyl] } zirconium dichloride; as well as the corresponding compounds wherein: the dimethylsilanediyl or 9-silafluorenediyl radical, respectively, in the above compounds is replaced by a dimethylamidoborane, diisopropylamidoborane or bis(trimethylsilyl)amidoborane radical; and/or the zirconium dichloride or zirconium dimethyl radical, respectively, in the above compounds is replaced by η 4 -l,4-diphenyl-l,3-butadiene (or, in the case of the above 9-silafluorenediyl compounds, additionally a zirconium dimethyl radical). Further illustrative and non-limiting examples of metallocene compounds of the present invention include all of the compounds set forth above wherein the zirconium atom is replaced by a hafnium atom. The above names represent the individual stereoisomers as well as mixtures of any ratios thereof. For example, "dimethylsilanediylbis! 1 -[2,5- dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride" represents rac- dimethylsilanediylbis{l-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride, me-SO-dimethylsilanediylbis{ l-[2,5-dimethyl-4-(3,5- dimethylphenyl)indenyl]}zirconium dichloride and any mixtures of these compounds. Moreover, the term"biphenylyl" in the above names is synonymous with "pheny lphenyl". Also, the term "9-silafluorenediyl-" refers to a group of the following formula: The metallocenes of this invention may be prepared according to general techniques known from the literature. See, for example, U.S. Patent Nos. 5,789,634 and 5,840,644 as well as WO 98/40331, each fully incorporated herein by reference. Generally, metallocenes of this type are synthesized as shown below (for R 4 =H) where (a) is an aryl-coupling reaction between a 4-halosubstituted indene and an aryl Grignard reagent catalyzed by NiCl 2 (PPh 3 ) 2 in ether-type solvents at room temperature to reflux. Product is usually purified by column chromatography or distillation, (b) is a deprotonation via a metal salt of an alkyl anion (e.g. n-BuLi) to form an indenide followed by reaction with an appropriate bridging precursor (e.g. Me SiCl ). Reactions are usually done in ether-type solvents at ambient temperatures. The final product is purified by column chromatography or distillation; and (c) is double deprotonation via an alkyl anion (e.g. n-BuLi) to form a dianion followed by reaction with a metal halide (e.g. ZrCl 4 ). The reactions are usually done in ether-type or aromatic solvents at ambient temperatures. The final products are obtained by recrystallization of the crude solids. An appropriately substituted indene for making the desired bridged ligand can be prepared by methods well known to those skilled in the art. See, for example, U.S. Patent No. 5,789,634 and WO 98/40331, supra, as well as WO 01/14388, EP-A-0 576 970 and EP-A-0 629 632, all of which are fully incorporated herein by reference. - 126- The metallocenes of this invention are highly active catalyst components for the polymerization of olefins. They can form different stereoisomers and are preferably employed as chiral racemates. However, it is also possible to use the individual enantiomers in the (+) or (-) form. The individual stereoisomers allow an optically active polymer to be prepared. In some cases it may be desirable to remove the meso form of the metallocenes, since the polymerization-active center (the metal atom) in these compounds is no longer chiral due to the mirror symmetry at the central metal atom and it is, therefore, not possible to produce a highly isotactic polymer. • If the meso form is not removed, atactic polymer is formed in addition to isotactic polymer. For certain applications (e.g., if a random copolymer of propylene and ethylene and/or any other monoolefin and/or diene is to be made) this may be entirely desirable. Accordingly, racemic metallocenes contaminated with not more than about 5 %, preferably not more than about 2 %, and even more preferred not more than about 1%, of the meso form represent a particularly preferred embodiment of the metallocenes of the present invention. In another preferred embodiment, the meso form of a metallocene of the present invention is contaminated with not more than about 5 %, preferably not more than about 2 %, and even more preferred not more than about 1%, of the racemic form. Rac/meso metallocene isomer separation is facilitated when metallocenes containing certain bridging groups are prepared. This has been found to be true when the bridging group, R 13 , is represented by the formula: wherein M 2 and R 17 to R 24 are as defined above. Metallocenes are generally used in combination with some form of activator in order to create an active catalyst system. The terms "activator" and "cocatalyst" are used interchangeably and are defined herein to mean any compound or component, or combination of compounds or components, capable of enhancing the ability of one or more metallocenes to polymerize olefins. Alkylalumoxanes such as methylalumoxane (MAO) are commonly used as metallocene activators. The alumoxanes which may be employed according to the present invention are not particularly limited. They include oligomeric linear and/or cyclic alkylalumoxanes of the general formula R-(Al(R)-O) n -AlR 2 for oligomeric, linear alumoxanes and (-Al(R)-O-) m for oligomeric cyclic alumoxanes wherein n usually is 1-40, preferably 10-20, m usually is 3-40, preferably 3-20, and R usually is a Cι-C 8 alkyl group (e.g., methyl, ethyl, n-propyl, isopropyl, n- butyl and isobutyl), and preferably methyl to provide methylalumoxane (MAO). MAO is a mixture of oligomers with a very wide distribution of molecular weights and usually with an average molecular weight of about 1200. MAO is typically kept in solution in toluene. It is also possible to use, for the present purpose, alumoxanes of the type just described wherein the alkyl groups in the above general formulae are different. A preferred example thereof is modified methylalumoxane (MMAO) wherein in comparison to MAO a part of the methyl groups is replaced by other alkyl groups. Alumoxane solutions, particularly methylalumoxane solutions, may be obtained from commercial vendors as solutions having various concentrations. There are a variety of methods for preparing alumoxane, non-limiting examples of which are described in U.S. Patent Nos. 4,665,208, 4,952,540, 5,091,352, 5,206,199, 5,204,419, 4,874,734, 4,924,018, 4,908,463, 4,968,827, 5,308,815, 5,329,032, 5,248,801, 5,235,081, 5,103,031, 6,001,766 and EP-A-0 561 476, EP-B1-0 279 586, EP-A-0 594-218 and WO 94/10180, each fully incoφorated herein by reference. Generally the atomic ratio of Al in the alumoxane to metal in the metallocene compound is at least about 10 : 1, more preferably at least about 50 : 1, and most preferred at least about 80 : 1. On the other hand said ratio is generally not higher than about 1,000 : 1, particularly not higher than about 500 : 1, with a ratio of not higher than about 300 : 1 being particularly preferred. Ionizing activators may also be used to activate metallocenes. These activators are neutral or ionic, or are compounds such as tri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, which ionize the neutral metallocene compound. Unlike alumoxane cocatalysts, these ionizing activators can usually be employed in a molar ratio with respect to the metallocene which is much closer to 1:1 (e.g., less than 5:1, less than 2:1, and preferably about 1:1). Such ionizing compounds may contain an active proton, or some other cation associated with, but not coordinated or only loosely coordinated to, the remaining ion of the ionizing compound. Combinations of activators may also be used, for example, alumoxane and ionizing activator combination, see for example, WO 94/07928 (incoφorated herein by reference in its entirety). Descriptions of ionic catalysts for coordination polymerization comprised of metallocene cations activated by non-coordinating anions appear in the early work in EP-A-0 277 003, EP-A-0 277 004 and U.S. Patent No. 5,198,401 and WO-A-92/00333 (each fully incoφorated herein by reference). These teach desirable methods of preparation wherein metallocenes are protonated by an anion containing or ionic precursor such that an alkyl/hydride group is abstracted from a transition metal to make it both cationic and charge-balanced by the non- coordinating anion. Suitable ionic salts include tetrakis-substituted borate or aluminum salts having fluorinated aryl constituents such as phenyl, biphenyl and naphthyl. The term "non-coordinating anion" (NCA) means an anion which either does not coordinate to said cation or which is only weakly coordinated to said cation thereby remaining sufficiently labile to be displaced by a neutral Lewis base. "Compatible" non-coordinating anions are those which are not degraded to neutrality when the initially formed complex decomposes. Further, the anion will not transfer an anionic substituent or fragment to the cation so as to cause it to form a neutral four coordinate metallocene compound and a neutral by-product from the anion. Non-coordinating anions useful in accordance with this invention are those which are compatible, stabilize the metallocene cation in the sense of balancing its ionic charge at +1, yet retain sufficient lability to permit displacement by an ethylenically or acetylenically unsaturated monomer during polymerization. The use of ionizing ionic compounds not containing an active proton but capable of producing both the active metallocene cation and a non-coordinating anion is also known. See, for example, EP-A-0 426 637 and EP-A- 0 573 403 (each fully incoφorated herein by reference). An additional method of making the ionic catalysts uses ionizing anion precursors which are initially neutral Lewis acids but form the cation and anion upon ionizing reaction with the metallocene compounds, for example the use of tris(pentafluorophenyl)borane. See EP-A-0 520732 (incoφorated herein by reference in its entirety). Ionic catalysts for addition polymerization can also be prepared by oxidation of the metal centers of transition metal compounds by anion precursors containing metallic oxidizing groups along with the anion groups, see EP-A-0 495 375 (fully incoφorated herein by reference). Where the metal ligands include halogen moieties (for example, chloride) which are not capable of ionizing abstraction under standard conditions, they can be converted via known alkylation reactions with organometallic compounds such as lithium or aluminum hydrides or alkyls, alkylalumoxanes, Grignard reagents, etc. See EP-A-0 500 944 and EP-A1-0 570 982 (each fully incoφorated herein by reference) for in situ processes describing the reaction of alkyl aluminum compounds with dihalo-substituted metallocene compounds prior to or with the addition of activating anionic compounds. Methods for supporting ionic catalysts comprising metallocene cations and NCAs are described in WO 9950311, U.S. Patent Nos. 5,643,847, 5,972,823, 6,143,686, and 6,228,795 (each fully incoφorated herein by reference). When the activator for the metallocene supported catalyst composition is a NCA, preferably the NCA is first added to the support composition followed by the addition of the metallocene catalyst. When the activator is MAO, preferably the MAO and metallocene catalyst are dissolved together in solution. The support is then contacted with the MAO/metallocene catalyst solution. Other methods and orders of addition will be apparent to those skilled in the art. The catalyst compositions of this invention preferably comprise a support. Suitable supports include porous particulate materials, such as for example, talc, inorganic oxides, inorganic chlorides such as magnesium chloride, and resinous materials such as polyolefins or other polymers. Preferably, the support materials are porous inorganic oxide materials, which include those from the Periodic Table of Elements of Groups 2, 3, 4, 5, 13 or 14 metal/metalloid oxides. Silica, alumina, silica-alumina, and mixtures thereof are particularly preferable. Other inorganic oxides that may be employed either alone or in combination with the silica, alumina or silica-alumina are magnesia, titania, zirconia, and the like. In one preferred embodiment the support material is porous silica, more preferably porous silica which has a surface area in the range of not less than 10, preferably not less than 50, and most preferred not less than 100 m /g , but usually not more than 700, preferably not more than 500, and most preferred not more than 400 m 2 /g. The total pore volume thereof usually is not less than 0.1, preferably not less than 0.5, and most preferred not less than 0.8 cc/g, whereas the pore volume generally is not higher than 4.0, preferably not higher than 3.5, most preferred not higher than 3.0 cc/g. The average particle size of the porous silica should be at least 10, preferably at least 20, and most preferred at least 30 μm, the maximum value thereof usually being not higher than 500, preferably not higher than 200, and most preferred not higher than 100 μm. The average pore size of typical porous support materials usually is at least 10, preferably at least 50, and even more preferably at least 75 A. Average pore sizes should generally not be higher than 1000, preferably not higher than 500, and most preferred not higher than 350 A. It may be particularly desirable to dehydrate the silica at a temperature of from 100°C to 800°C anywhere from 3 to 24 hours. The metallocene, activator and support material may be combined in any number of ways. More than one metallocene may also be used. Examples of suitable support techniques are described in U. S. Patent Nos. 4,808,561 and 4,701,432 (each fully incoφorated herein by reference). Preferably metallocene and activator are combined and their contact product is supported on the porous support material as described in U. S. Patent No. 5,240,894 and WO 94/28034, WO 96/00243, and WO 96/00245 (each fully incoφorated herein by reference). Alternatively, the metallocenes may be preactivated separately and then combined with the support material either separately or together. If the metallocenes are separately supported, then preferably, they are dried and then combined as a powder before use in polymerization. Regardless of whether the metallocene(s) and their activator are separately precontacted or whether the metallocene(s) and activator are combined at once, in some instances it may be preferred that the total volume of reaction solution applied to the porous support is less than 4 times the total pore volume of the porous support, more preferably less than 3 times the total pore volume of the porous support and even more preferably in the range of from more than 1 to less than 2.5 times the total pore volume of the porous support. Procedures for measuring the total pore volume of porous support are well known in the art. One such method is described in Volume 1, Experimental Methods in Catalyst Research, Academic Press, 1968, pages 67-96, fully incoφorated herein by reference. The supported catalyst system may be used directly in polymerization or the catalyst system may be prepolymerized using methods well known in the art. For details regarding prepolymerization, see U. S. Patent Nos. 4,923,833 and 4,921,825, and EP 0 279 863 and EP 0 354 893 (each fully incoφorated herein by reference). The metallocene catalyst systems described herein are useful in the polymerization of all types of olefins. This includes polymerization processes which produce homopolymers, copolymers, teφolymers and the like as well as block copolymers and impact copolymers. These polymerization processes may be carried out in solution, in suspension or in the gas phase, continuously or batchwise, or any combination thereof, in one or more steps, usually at a temperature not lower than 30, preferably not lower than 50, most preferred not lower than 80° C, and not higher than 200, preferably not higher than 120, most preferred not higher than 100°C. Preferably, the polymerization or copolymerization is carried out using olefins of the formula R a -CH=CH-R b . In this formula, R a and R b are identical or different and are a hydrogen atom or an alkyl or alkenyl radical having 1 to 14 carbon atoms. Alternatively, R a and R b may form a ring together with the carbon atoms connecting them. Examples of such olefins are ethylene, propylene, 1-butene, 1-hexene, 4-methyl-l-pentene, and 1-octene, vinylcyclohexane, norbornene and norbornadiene. In particular, propylene and ethylene are polymerized. The metallocenes and metallocenes catalyst systems of this invention are most suitable for the polymerization of propylene based polymers. If necessary, hydrogen is added as a molecular-weight regulator and/or in order to increase the activity. The overall pressure in the polymerization system usually is at least about 0.5 bar, preferably at least about 2 bar, most preferred at least about 5 bar. Pressures higher than about 100, e.g., higher than about 80 bar and, in particular, higher than about 64 bar are usually not preferred. Typically, the metallocene is used in the polymerization in a concentration, based on the transition metal, of not less 10 "4 , preferably not less than 10 "3 mol, and not higher than 10 7 , preferably not higher than 10 4 mol, of transition metal per dm 3 of solvent or per dm 3 of reactor volume. When alumoxane is used as the cocatalyst, it is used in a concentration of usually not less than 10 "4 ,preferably not less than 10 " mol, and not higher than 10 " , preferably not higher than 10 " mol, per dm of solvent or per dm of reactor volume. The other cocatalysts mentioned are used in an approximately equimolar amount (e.g., from about 1.2 : 1 to about 1 : 1.2) with respect to the metallocene. In principle, however, higher concentrations are also possible. If the polymerization is carried out as a suspension or solution polymerization, an inert solvent which is customary for the Ziegler low-pressure process is typically used for example, the polymerization is carried out in an aliphatic or cycloaliphatic hydrocarbon; examples of which are propane, butane, hexane, heptane, isooctane, cyclohexane and methylcyclohexane. It is also possible to use mineral spirit or a hydrogenated diesel oil fraction. Toluene can also be used. The polymerization is preferably carried out in the liquid monomer(s). If inert solvents are used, the monomer(s) is (are) metered in gas or liquid form. Before addition of the catalyst, in particular of the supported catalyst system, another alkylaluminum compound, such as, for example, trimethylaluminum, triethylaluminum, triisobutylaluminum, trioctylaluminum or isoprenylaluminum, may additionally be introduced into the reactor in order to render the polymerization system inert (for example to remove catalyst poisons present in the olefin). This compound is added to the polymerization system in a concentration of from 100 to 0.01 mmol of Al per kg of reactor contents. Preference is given to triisobutylaluminum and triethylaluminum in a concentration of from 10 to 0.1 mmol of Al per kg of reactor contents. This allows the molar Al/M 1 ratio to be selected at a low level in the synthesis of a supported catalyst system. In principle, however, the use of further substances for catalysis of the polymerization reaction is unnecessary, i.e., the systems according to the invention can be used as the only catalysts for the polymerization of olefins. The process according to the invention is distinguished by the fact that the metallocenes described can give propylene polymers of very high molecular weight, melting point, and very high stereotacticity, with high catalyst activities in, e.g., the temperature range from about 40°C to about 100°C, such as the industrially particularly interesting polymerization temperature range of from about 50°C to about 80°C . The catalyst systems of this invention are capable of providing polymers, particularly propylene homopolymers and copolymers, of exceptionally high molecular weight and melting point even when used in processes under commercially relevant conditions of temperature, pressure and catalyst activity. Preferred melting points of olefin polymers comprising at least about 99 % by weight, preferably are at least about 99.3 % by weight and most preferred at least 99.5 % by weight of units derived from propylene (the remainder being preferably derived from one or more compounds selected from ethylene and 1 -olefins comprising 4 to 12 carbon atoms, most preferred ethylene) are as high as 155°C, e.g., as high as 156°C, more preferably at least 157°C, even more preferably at least 158°C, and may be as high as 160°C or even higher (these melting points being determined by DSC according to the procedure described in the Examples below). With respect to molecular weights, copolymers made with the catalyst systems of the present invention such as, e.g., ethylene/propylene rubbers (EPR's) or ethylene/propylene/diene copolymers (EPDM's), usually have an intrinsic viscosity, measured in decalin at 135° C, of usually at least about 1.8, "preferably at least about 2.0, and more preferred at least about 2.1 (e.g., at least about 2.2). This enables the production of very satisfactory impact copolymers (ICP's), such as in situ blends of propylene homopolymer or copolymer as discussed above of high melting point (and preferably also high molecular weight) and propylene copolymers (such as EPR's and/or EPDM's) of high intrinsic viscosity with a single catalyst system (and, preferably, in a single reactor). For this puφose, the copolymers generally will have an ethylene content of at least about 30, preferably at least about 35, more preferred at least about 40 weight % and not more than about 60, preferably not more than about 50 weight %. The ethylene content of the ICP's usually will be at least about 1.5, preferably at least about 3 weight percent and up to about 20, preferably up to about 15, weight %. The homo- and copolymers made with the catalyst systems of the present invention (e.g., those containing units derived from propylene, or from propylene and ethylene) also have a narrow molecular weight distribution, M w /M n , usually of not higher than about 3.5, preferably not higher than about 3.0, more preferred not higher than about 2.5 and sometimes even not higher than about 2.2. They also are distinguished by low xylene and n-hexane extractables contents. Often the xylene extractables and/or the n-hexane extractables of these homo- and copolymers will amount to less than about 2.0, preferably less than about 1.5, even more preferred less than about 1.0 weight %. A general description of the procedure for measuring the xylene extractables (solubles) is found in J. C. Randall, J. Poly. Sci.: Part A Polymer Chemistry, Vol. 36, 1527-1542 (1998), incoφorated herein by reference in its entirety. Hexane extractions are performed by weighing the polymer sample in a dried soxhlet thimble. Hexane is heated to reflux through the thimble in the soxhlet apparatus. When the extraction is complete the solvent is evaporated, and the sample dried under the appropriate vacuum. The amount of extractables is determined by weight. The thimble containing the insoluble polymer is dried in a vacuum oven and the weight of the recovered polymer is determined. The polymer compositions made in accordance with the present invention are also characterized by a relatively narrow molecular weight distribution. Their values of M w /M n (as determined by Gel Permeation Chromatography using polystyrene standards, see Examples below) usually are not higher than about 3.5, often not higher than about 3.0, e.g., not higher than about 2.7. Catalyst systems of this invention are capable of providing propylene polymers having high stereospecificity and regiospecificity. Isotactic propylene polymers prepared according to the processes of this invention may have a proportion of 2,1 -inserted propene units of less than about 0.5%, at a triad tacticity of greater than about 98%. Preferably, there is no measurable proportion of 2,1- inserted propene units. Triad tacticity is determined using C-NMR according to J.C. Randall, Polymer Sequence Determination: Carbon- 13 NMR Method, Academic Press New York 1978, incoφorated herein by reference in its entirety. Polymers prepared using the processes described herein find uses in all applications including fibers, injection-molded parts, films, pipes, and wire and cable applications. Non-limiting examples include caφet fibers and primary and secondary caφet backing; slit tape applications such as taφaulins, erosion abatement screens, sand bags, fertilizer and feed bags, swimming pool covers, intermediate bulk container (IBC) bags; non-woven applications for spunbonded, melt blown and thermobonded carded web applications such as disposable diaper liners, feminine hygiene products, taφaulins and tent fabrics, and hospital garments; apparel applications such as socks, T-shirts, undergarments, bicycle shorts, sweat bands, football undershirts, hiking socks and other outdoor sporting apparel; cordage applications such as mooring and towing lines and rope applications; netting applications such as safety fences, geogrids for soil stabilization; injection molded applications such as appliance parts in automatic dishwashers and clothes washers, hand tools and kitchen appliances; consumer product applications such as outdoor furniture, luggage, infant car seats, ice coolers, yard equipment; medical applications such as disposable syringes and other hospital and laboratory devices; rigid packaging made by injection molding, blow molding or thermoforming such as margarine tubs, yogurt containers and closures, commercial bottles and ready-to-eat food containers; transportation applications such as automotive interior trim, instrument panels, bumper fascia, grills and external trim parts, battery cases; film applications such as snack packages and other food packaging and film labels, packing tapes and pressure sensitive labels; wire and cable applications such as wire insulation . While the present invention has been described and illustrated by reference to particular embodiments, it will be appreciated by those of ordinary skill in the art, that the invention lends itself to many different variations not illustrated herein. For these reasons, then, reference should be made solely to the appended claims for purposes of determining the true scope of the present invention. Although the appendant claims have single appendencies in accordance with U.S. patent practice, each of the features in any of the appendant claims can be combined with each of the features of other appendant claims or the main claim. EXAMPLES All air sensitive experiments are carried out in nitrogen purged dry boxes. All reagents and solvents were purchased from commercial sources. Aluminium alky Is were purchased as hydrocarbon solutions from commercial sources. The commercial methylalumoxane ("MAO") was purchased from Albemarle as a 30 wt% solution in toluene. Racemic dimethylsilanediylbis(2-methyl-4-phenyl- indenyl)zirconium dichloride was obtained from commercial sources and used as received. I. 4-BROMO-2,5 DIMETHYLINDENE SYNTHESIS (a) 2-(Bromomethyl)-6-methyl bromobenzene A procedure similar to that described in Bull. Chem. Soc. Japan, 59, 3285- 3286 (1986), fully incoφorated herein by reference, was used. In a two liter round bottom flask equipped with an overhead stirrer and heating mantle was placed 2-bromo-meta-xylene (60.08 g, 0.325 mol) and carbon tetrachloride (650 ml). To this were added N-bromosuccinimide (57.78 g, 0.325 mol) and an additional 550 ml carbon tetrachloride. After stirring fifteen minutes benzoyl peroxide (0.72 g, 2.9 mmol, 0.9 mole %) was added, and the mixture was heated to reflux. After four hours the reaction was cooled, and the carbon tetrachloride was removed. The residue was taken up in 10% methylene chloride in n-hexane (600 ml) and filtered through silica (250 g). The filter cake was washed with an additional 400 ml of the in 10% methylene chloride in n-hexane. The filtrate was evaporated to give a clear liquid (74.22 g, 51% conversion by NMR). Vacuum distillation produced a fraction distilling at 72°C-80°C at 0.1 Torr as a water white liquid (40.62 g, 47% yield). NMR (CD 2 C1 2 ). 7.2 (m, 3H), 4.62 (s, 2H), 2.4 (s, 3H). Elemental analysis: 36.18% C, 3.12% H, 61.14% Br (theory: 36.40% C, 3.06% H, 60.54% Br) (b) 4-Bromo-2,5-dimethylindene In a 500 ml round bottom flask was placed sodium hydride (95%, 3.83 g, 0.1516 mol) and THF (100 ml, anhydrous). After equipping the flask with an overhead stirrer the resultant slurry was cooled to 5° C. In an addition funnel was placed diethyl methylmalonate (26.44 g, 0.1518 mol, previously dried over 3 A sieves). This was added dropwise over thirty minutes to the sodium hydride slurry while maintaining the temperature below 10°C. After the addition the bath was removed and stirring continued for two hours. The reaction was recooled to 5°C. In an addition funnel was placed 2-(bromomethyl)-6-methyl bromobenzene (39.64 g, 0.150 mol), prepared as described under (a) above, and added dropwise over one hour while maintaining the temperature below 5°C. The bath was then removed and the stirring continued overnight. Thereafter, a solution of sodium hydroxide in water (30 ml of 15 g NaOH in 30 ml water) was added and the resultant mixture was stirred for five minutes. Then water (80 ml) was added. The resultant white slurry was heated to distill the THF (60-65°C). Heating was continued until an internal temperature of 100-110°C was reached and water (25 ml) was added. After 45 minutes the distillation of THF was complete. The reaction mixture was cooled and then poured rapidly with stirring into concentrated HCl (80 ml) and water (80ml), affording a white precipitate. This was collected on a coarse frit funnel and washed three times (25 ml each time) with water. The solid was dried on the frit under vacuum and then dried at ambient temperature in a nitrogen flow for three days to give the diacid solid (45.17 g, 0.150 mol, 95%). This was placed in a 500 ml flask and heated over several hours to 150-155°C at which the solid melted and gas evolution became rapid. After one hour the gas (CO 2 ) evolution stopped. The flask was cooled to 70°C and heptane (100 ml) added. After heating to 80°C the solids went into solution. The solution was cooled to 45°C and thionyl chloride (20 ml, 0.255 mol, ca. 70% excess) was added dropwise over fifteen minutes. The resultant mixture . was heated to 60 - 70°C for 140 minutes. The flask was equipped with a distillation head, heated to 120 - 130 °C to distill off excess thionyl chloride and n-heptane and then cooled. Methylene chloride (100ml) was added and the flask cooled to 5°C, whereafter aluminum trichloride (30 g) was added slowly in 10 g portions. The temperature rose to about 10 - 15 °C and the mixture was stirred fifteen minutes and then an additional fifteen minutes at 0 - 5°C. The cooling bath was removed and the contents of the flask stirred for two hours at room temperature. The resultant mixture was cautiously poured onto ice (120 g) with stirring and then stirred one hour. The organic (methylene chloride) layer that had formed was separated and the aqueous layer extracted with methylene chloride. The combined organic portions were washed with water (100 ml, twice), 5% sodium bicarbonate (100 ml, twice) and saturated NaCl solution (250 ml) and then dried over sodium carbonate with stirring. Filtering and evaporation of the solvent gave the corresponding ketone (18.7 g, 52%) overall). This was placed in a 250 ml round bottom flask, dissolved with methanol (50 ml) and cooled to 10°C. In a second flask a slurry of NaBH 4 (3.19 g, 0.084 mol) in methanol (25 ml) containing sodium methoxide (50 mg) was prepared and slowly added to the solution of the ketone at <10°C. After stirring one hour at 10°C an additional 50 ml methanol was added and then stirred overnight at room temperature. Thereafter water (75 ml) was added with stirring. The mixture was extracted with methylene chloride (3 times, 150 ml each) and then volatile organic materials were evaporated to give a white solid (19.28 g). The solid was placed in a three neck flask, followed by toluene (125 ml) and p-toluene sulfonic acid (0.13 g). This mixture was heated to reflux, and the water removed through a Dean-Stark trap over four hours. After cooling a 5% NaHCO 3 solution was added along with diethyl ether (50 ml). The aqueous layer was extracted with additional ether. The organic portions were combined, dried over sodium sulfate, filtered and evaporated with a flow of nitrogen overnight. These resulting crystals were dried under vacuum for two hours to give beige crystals (15.90 g, 48% overall yield from dibromide). NMR (CD 2 C1 2 ) 7.1 (s, 2H), 6.5 (s, IH), 3.3 (s, 2H), 2.4 and 2.15 (both s, 6H). Elemental analysis: 58.84% C, 5.09% H, 35.65% Br (theory: 59.22% C, 4.97% H, 35.81% Br). II. METALLOCENE SYNTHESIS A. Dimethylsilanediylbis [2,5-dimethyI-4-phenylindenyl]zirconium dichloride (a) 2,5-Dimethyl-4-phenylindene 4-Bromo-2,5-dimethylindene (9.0 g, 40 mmol), prepared as described under I.(b) above, and NiCl (PPh 3 ) (1.8 g, 2.8 mmol) were dissolved in 300 ml of diethyl ether (Et 2 O). Phenylmagnesium bromide, 3.0 M in Et 2 O, (13.5 ml, 40 mmol) was added under vigorous stirring and the reaction stirred overnight at reflux. The resultant reaction was slowly quenched with H 2 O to neutralize unreacted Grignard reagent, subsequently treated with 100 ml of 10% HCl(aq), and neutralized with saturated sodium bicarbonate aqueous solution. The resultant organic layer was dried with magnesium sulfate, and the solvent was removed by rotary evaporation. The remaining residue was loaded onto a silica gel column and eluted with hexane. Yield is 1.3 g (15 %). (b) Lithium [2,5-dimethyl-4-phenylindenide] 2,5-Dimethyl-4-phenylindene (1.3 g, 5.9 mmol), prepared as described under (a) above, was dissolved in 100 ml of pentane. To this solution was added 2.4 ml of nBuLi (n-butyl lithium, 2.5 M in hexane) and the reaction was stirred five hours at room temperature. A yellow-white solid precipitated from solution and was collected by frit filtration and washed with additional pentane. Yield: 1.2 g (98%). (c) Dimethylsilanediylbis[2,5-dimethyl-4-phenylindene] Dichlorodimethylsilane (0.35 g, 2.8 mmol) was dissolved in 30 ml of THF. While stirring, lithium[2,5-dimethyl-4-phenylindenide] (1.2 g, 5.5 mmol), prepared as described under (b) above, was added thereto as a dry powder and the resultant mixture was stirred at reflux for three hours. Thereafter the solvent was removed in vacuo and the residue was taken up in pentane and filtered to remove LiCl. The pentane was removed in vacuo, and the crude product was isolated. Yield: 1.3 g (100 %). (d) Dimethylsilanediylbis[2,5-dimethyl-4-phenylindenyl]zirconium dichloride Dimethylsilanediylbis[2,5-dimethyl-4-phenylindene] (1.3 g, 2.8 mmol), prepared as described under (c) above, was dissolved in 50 ml of Et 2 O. While stirring, 2.2 ml of nBuLi (2.5 M in hexane) was added, followed by stirring at room temperature for one hour. After this time, the solution was cooled to -35°C and ZrCl 4 (0.63 g, 2.8 mmol) was added, followed by stirring at room temperature for three hours. Thereafter the solvent was removed in vacuo and the residue was taken up in toluene and filtered to remove LiCl. The filtrate was then concentrated and chilled to -35°C to induce crystallization. 90 mg (5.1 %) of pure racemic compound was obtained. B. Dimethylsilanediylbis [2,5-dimethyl-4-(3,5-dimethylphenyI)indenyl] - zirconium dichloride (e) 3,5-Dimethylphenylboronic acid 3,5-Dimethylbromobenzene (10 g, 54 mmol) and magnesium (2.5 g, 108 mmol) were dissolved in 100 mL of THF and stirred at reflux for five hours. After this time, triisopropylborate (10 g, 54 mmol) as a solution in diethylether (50 mL) was added to the solution, followed by stirring at room temperature overnight. The THF was removed in vacuo to leave a crude oil. This oil was taken up in 100 mL of diethylether and 100 mL of 10% sulfuric acid (aqueous) and stirred for two hours. The organic layer was separated and neutralized with saturated sodium bicarbonate solution, whereafter the solvent was removed in vacuo to yield a white solid. The solid was washed generously with pentane. Yield: 4.0 g (49 %). (f) 2,5-Dimethyl-4-(3 ,5-dimethylphenyl)indene 3,5-Dimethylphenylboronic acid (2.3 g, 15 mmol), prepared as described under (e) above, cesium carbonate (4.9 g, 15 mmol), and Pd (dba) 3 (87 mg, 94 μmol) (dba = dibenzylidene acetone) were dissolved in 30 ml of 1,4-dioxane. To the resultant solution were added P(t-Bu) 3 (57 μL, 280 μmol) and 4-bromo-2,5- dimethylindene (3.1 g, 15 mmol) and the reaction was stirred at 80°C for five hours. After this time, the solvent was removed in vacuo and the residue was taken up in 100 ml of diethyl ether and filtered through a celite-packed frit to remove cesium salts. Thereafter the solvent was removed in vαcuo and the residue was loaded onto a silica gel column and eluted with hexane. Yield: 2.1 g (56%). (g) Lithium[2,5-dimethyl-4-(3 ,5 -dimethy lphenyl)indenide] 2,5-Dimethyl-4-(3,5-dimethylphenyl)indene (2.1 g, 8.4 mmol), prepared as described under (f) above, was dissolved in 60 ml of pentane. To this solution was added 3.4 ml of nBuLi (2.5 M in hexane) and the reaction was stirred for two hours at room temperature. A white solid precipitated from solution and was collected by frit filtration and washed with additional pentane. Yield: 1.6 g (74%). (h) Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-dimethylphenyl)indene] Dichlorodimethylsilane (0.40 g, 3.1 mmol) was dissolved in 40 ml of THF. While stirring, lithium[2,5-dimethyl-4-(3,5-dimethylphenyl)indenide] (1.6 g, 6.2 mmol), prepared as described under (g) above, was added as a dry powder and the resultant mixture was stirred overnight at room temperature. Thereafter the solvent was removed in vαcuo and the residue was taken up in pentane and filtered to remove LiCl. The pentane was removed in vαcuo to yield a flaky white solid (1.7 g, 100 %). (i) Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]zirconium dichloride Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-dimethylphenyl)indene] (1.7 g, 3.1 mmol), prepared as described under (h) above, was dissolved in 50 ml of Et 2 O. While stirring, 2.5 ml of nBuLi (2.5 M in hexane) was added, followed by stirring at room temperature for two hours. After this time, the solution was cooled to -35°C and ZrCl 4 (0.71 g, 3.1 mmol) was added, followed by stirring at room temperature for 3 hours. The solvent was then removed in vacuo and the residue was taken up in a mixture of methylene chloride and pentane and filtered to remove LiCl. The filtrate was then concentrated and chilled to -35°C to induce crystallization. 0.18 g (8.0%) of pure racemic compound was obtained. C. Dimethylsilanediylbis [2,5-dimethyl-4-(3,5-di-/-butylphenyI)indenyl1- zirconium dichloride (j) 3,5-Di-t-butylphenylboronic acid 3,5-Di-t-butylbromobenzene (10 g, 37 mmol) and magnesium (1.8 g, 75 mmol) were dissolved in 100 mL of THF and stirred at reflux for five hours. After this time, triisopropylborate (7.0 g, 37 mmol) as a solution in diethylether (50 mL) was added to the solution, followed by stirring at room temperature overnight. Then the THF was removed in vacuo to leave a crude oil. This oil was taken up in 100 mL of diethylether and 100 mL of 10% sulfuric acid (aqueous) and stirred for two hours. The organic layer was separated and neutralized with saturated sodium bicarbonate solution, whereafter the solvent was removed in vacuo to yield a white solid. The solid is washed generously with pentane. Yield: 3.0 g (34%). (k) 2,5-Dimethyl-4-(3,5-di-t-butylphenyl)indene 3,5-Di-t-butylphenylboronic acid (4.4 g, 19 mmol), prepared as described under (j) above, cesium carbonate (7.3 g, 22 mmol), and Pd 2 (dba) 3 (0.24 g, 262 μmol) (dba = dibenzylidene acetone) were dissolved in 60 ml of 1,4-dioxane. To this solution were added P(t-Bu) 3 (170 μL, 830 μmol) and 4-bromo-2,5- dimethylindene (3.1 g, 19 mmol), followed by stirring at 80°C for five hours. After this time, the solvent was removed in vacuo and the residue was taken up in 150 ml of diethyl ether and filtered through a celite-packed frit to remove cesium salts. Then the solvent was removed in vacuo and the residue was loaded onto a silica gel column and eluted with hexane. Yield: 3.4 g (54%). (1) Lithium[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indenide] 2,5-Dimethyl-4-(3,5-di-t-butylphenyl)indene (3.4 g, 10 mmol), prepared as described above under (k), was dissolved in 200 ml of pentane. To the solution was added 4.1 ml of nBuLi (2.5 M in hexane), followed by stirring for four hours at room temperature. A white solid precipitated from solution and was collected by frit filtration and washed with additional pentane. Yield: 3.0 g (88%). (m) Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indene] Dichlorodimethylsilane (0.57 g, 4.4 mmol) was dissolved in 40 ml of Et 2 O. While stirring, lithium[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indenide] (3.0 g, 8.8 mmol), prepared as described under (1) above, was added as a dry powder, followed by 5 ml of THF. The resultant mixture was stirred overnight at room temperature, whereafter the solvent was removed in vacuo and the residue was taken up in Et 2 O and filtered to remove LiCl. Then the Et 2 O was removed in vacuo and the remaining oil was loaded onto a silica gel column and eluted with hexane. Yield: 3.1 g (97 %). (n) Dimethylsilanediylbis[2,5-dimethyl-4-(3,5-di-t-butylphenyl)indenyl]zirconium dichloride Dimethylsilanediylbis[2,5-dimethyl-4-(3 ,5-di-t-butylphenyl)indene] (3.1 g, 4.3 mmol), prepared as described under (m) above, was dissolved in 50 ml of Et 2 O. While stirring, 3.4 ml of nBuLi (2.5 M in hexane) was added, followed by stirring at room temperature for 0.5 hour. After this time, the solution was cooled to -35°C and ZrCl 4 (1.0 g, 4.3 mmol) was added. After stirring at room temperature for one hour, the resultant solution was filtered through a celite frit to remove LiCl. Thereafter the solvent was removed in vacuo and the resultant crude solid was dissolved in pentane, followed by cooling to induce crystallization. The pure racemic isomer was collected as yellow crystals. Yield: 700 mg (18%). III. SUPPORTED CATALYST COMPOSITION SYNTHESIS A. Supported Metallocene Catalyst Composition A In a 100 mL round bottom flask dimethylsilanediylbis[2,5-dimethyl-4- phenylindenyl]zirconium dichloride (0.058 g), prepared as described under II. A. above, was added to the above MAO-toluene solution (6.74 g, 7.15 ml) and stirred for twenty minutes. The resultant mixture was filtered through a medium glass frit funnel and washed with toluene (14 mL). To the combined filtrates was added dehydrated silica (4.0 g, Davison 948 Regular, 600°C dehydration) and the resultant slurry was stirred for twenty minutes, then dried at 40 °C for two minutes under vacuum on a rotary evaporator until the liquid had evaporated. Then the solid was further dried a total of about two hours and 23 minutes. The supported catalyst composition was recovered as a pink-orange, free flowing solid (5.64 g). Polymerization results are summarized in Tables 2A and 2B below. For comparison purposes, Tables IA and IB below summarize the results obtained with the corresponding metallocene wherein the methyl group in the 5-position of the indene ring is replaced by a hydrogen atom, i.e., dimethylsilanediylbis[l-(2- methyl-4-phenylindenyl)]zirconium dichloride. B. Supported Metallocene Catalyst Composition B In a 100 ml round bottom flask dimethylsilanediylbis[2,5-dimethyl-4-(3,5- dimethylphenyl)indenyl]zirconium dichloride (0.063 g), prepared as described under II.B. above, was added to the above MAO-toluene solution (6.74 g) and stirred for twenty minutes. The resultant mixture was filtered through a medium glass frit funnel and washed with toluene (14 ml). To the combined filtrates was added dehydrated silica (4.0 g, Davison 948 Regular, 600°C dehydration) and the resultant slurry was stirred for twenty minutes, then dried at 40 °C for two minutes under vacuum on a rotary evaporator until the liquid had evaporated. Then the solid was further dried a total of about two hours and 31 minutes. The supported catalyst composition was recovered as a pink-orange, free flowing solid (5.60 g). Polymerization results are summarized in Tables 3A and 3B below. C. Supported Metallocene Catalyst Composition C In a 100 ml round bottom flask dimethylsilanediylbis[2,5-dimethyl-4-(3,5- di-tert-butylphenyl)indenyl]zirconium dichloride (0.078 g), prepared as described under II. C. above, was added to the above MAO-toluene solution (6.74 g, 7.3 ml) and stirred for twenty minutes. The resultant mixture was filtered through a medium glass frit funnel and washed with toluene (14 ml). To the combined filtrates was added dehydrated silica (4.0 g, Davison 948 Regular, 600°C dehydration) and the resultant slurry was stirred for twenty minutes, then dried at 40 °C for two minutes under vacuum on a rotary evaporator until the liquid had evaporated. Then the solid was further dried a total of about two hours and 27 minutes. The supported catalyst composition was recovered as a pink-orange, free flowing solid (5.75 g). Polymerization results are summarized in Tables 4A and 4B below. IV. POLYMERIZATIONS A. Isotactic Polypropylene Homopolymer The polymerization procedure for producing propylene homopolymers with the supported catalyst compositions described above was as follows. In a clean, dry two liter autoclave which had been flushed with propylene vapor, TEAL (triethylaluminum) scavenger (0.3 mL, 1.5M) was placed. Hydrogen gas was added at this point. The reactor was closed and filled with 800 mL liquid propylene. After heating the reactor to 70 °C, supported catalyst composition was added by washing in with propylene (200 mL). After the indicated time, typically one-hour, the reactor was cooled, and the excess propylene vented. Thereafter the polymer was removed and dried. B. Isotactic Ethylene-Propylene Random Copolymer (RCP) The polymerization procedure for producing ethylene-propylene random copolymers (RCP) with the above supported catalyst compositions was as follows. In a clean, dry two liter autoclave which had been flushed with propylene vapor, TEAL scavenger (0.3 mL, 1.5M) was placed. Hydrogen gas was added at this point, if used. The reactor was closed and filled with 800 mL liquid propylene. After heating the reactor to 60 °C , an oveφressure of ethylene, as indicated by the "delta kPa", was slowly added while maintaining 60°C. The ethylene inlet was closed while the catalyst composition was added by washing in with propylene (200 mL). Immediately after addition the ethylene inlet was reopened and the desired oveφressure of ethylene was maintained. After the indicated time, typically one-hour, the reactor was cooled, and the excess propylene vented. Then the polymer was removed and dried. C. Impact Copolymers (ICP) The polymerization procedure for producing ICP with the above supported catalyst compositions was as follows. In a clean, dry two liter autoclave which had been flushed with propylene vapor, TEAL scavenger (0.3 mL, 1.5M) was placed. Hydrogen gas was added at this point. The reactor was closed and filled with 800 mL liquid propylene. After heating the reactor to 70 °C, catalyst composition was added by washing in with propylene (200 mL). After the indicated time, typically one hour, the reactor was vented to about 170 psig (1172 kPa) pressure and then an ethylene/propylene gas mixture was passed through the reactor at the rates indicated while maintaining a pressure of 200 psig (1379 kPa). At the end of the gas phase stage, typically 90 to 150 minutes, the reactor was vented and cooled under N 2 . Then the granular ICP polymer was removed and dried. V. POLYMER ANALYSIS A. Molecular Weights Molecular weight determinations were made by gel permeation chromatography (GPC) according to the following technique. Molecular weights and molecular weight distributions were measured using a Waters 150°C gel permeation chromatography equipped with Shodex (Showa Denko) AT-80 M/S columns and a differential refractive index (DRI) detector operating at 145°C with 1,2,4-trichlorobenzene as the mobile phase at a 1.0 mL/min. flow rate. The sample injection volume was 300 microliters. The columns were calibrated using narrow polystyrene standards to generate a universal calibration curve. The polypropylene calibration curve was established using k = 8.33 X 10 ~ 5 and a = 0.800 as the Mark-Houwink coefficients. The numerical analyses were performed using Waters "Millennium" software. B. Melting Points DSC melting points were determined on commercial DSC instruments and are reported as the second melting point. The polymer sample was heated to 230.0°C for ten minutes and then cooled from 230°C to 50°C at 10°C/minute. The sample was held at 50°C for five minutes. The second melting point was then recorded as the sample was heated from 50°C to 200°C at a rate of 10°C/minute. The peak temperature was recorded as the second melting point. C. ICP Polymer Extraction Method The ICP polymer was dissolved in hot xylene and then allowed to cool overnight. After filtration the insolubles were dried. The xylene soluble portion was evaporated and the soluble material recovered. The IV (intrinsic viscosity) of the recovered soluble material was measured in decalin at 135°C by using known methods and instruments such as a Schott A VSPro Viscosity Automatic Sampler. At very high ICP MFR (melt flow ratio) this method can extract some low molecular weight isotactic polypropylene and thus lower the observed IV. D. ICP Polymer Fractionation Method The ICP samples were sent to Polyhedron Laboratories, Inc. to be fractionated and analyzed by GPC. A general description of the procedure is found in the reference J. C. Randall, J. Poly. Sci.: Part A Polymer Chemistry, Vol. 36, 1527-1542 (1998), supra. VI. RESULTS As can be seen from the results summarized in the above Tables, in comparison to the prior art (Tables IA and IB) the metallocene catalyst compositions of the present invention afford both propylene homopolymers and ethylene-propylene copolymers of considerably improved molecular weight. TABLE IA Dimethylsilanediylbis{l-[2-methyl-4-phenylindenyl]}zirconium dichloride RUN # TEMP. Cat! Yield Efficiency C W 2 Time 2 = I χ (°C) Amount (g) (Kg/g cat) (delta (mmole) split flow rates (mg to ) / kPa) J (min.) ' ( m1/mm ■ . \ ) 1 60 67 274.7 4.10 0 0 60 - 2 60 45 71.7 1.59 0 0 60 - 3 60 40 134.1 3.35 68.9 0 60 - 4 60 42 221.5 5.27 137.9 0 60 - 5 60 30 121.3 4.04 379.2 0 60 - 6 60 30 130.2 4.34 482.6 0 60 - 7 60 30 101.8 3.39 137.9 0 60 - 8 70 45 293.5 6.52 - 77.5 60 - 9 70 31 198.9 6.42 - 77.5 60 - 10 70 30 291.9 9.73 - 77.5 60/150 4.0/1.0 11 70 30 231.3 7.71 - 77.5 60/90 4.0/1.0 12 70 30 224.8 7.49 - 77.5 60/90 4.1/0.9 13 70 30 209.9 7.00 - 77.5 60/90 3.6/1.4 14 70 30 208.2 6.94 - 77.5 60/90 4.0/1.0 TABLE IB Dimethylsilanediylbis{l-[2-methyl-4-phenyIindenyI]}zirconium dichloride RUN # Total Ethylene Ethylene in Total Final MFR Melting Point MW MWD IV of (wt %) Rubber (wt%) Rubber (g/10 min.) (°C) (X 10 "3 ) Copolymer (wt %) (dl/g) 1 0.16 149.2 600.0 2.00 2 - - - 0.54 148.2 664.9 1.92 - 3 0.67 - - 0.84 142.0 349.0 2.09 - 4 1.28 - - 2.57 138.4 280.0 1.95 - 5 3.77 - - 6.48 121.4 255.0 2.04 - 6 4.43 - - 5.95 116.0 301.0 2.30 - 7 1.44 - - 2.05 137.5 330.4 2.23 - 8 - - - 99.6 150.3 120.6 3.01 - 9 - - - 58.95 150.9 135.7 3.15 - 10 13.23 49.20 26.89 178.5 151.2 81.2 3.37 0.7520 11 7.58 47.37 16.00 134.05 150.6 98.4 3.25 0.687 12 7.82 50.04 15.63 127.16 150.0 100.4 3.11 0.708 13 5.3 38.96 13.60 201.9 150.43 91.2 3.28 0.779 14 0.47 64.32 0.73 97.1 150.8 116.8 3.42 Not submitted TABLE 2A DimethyIsiIanediyIbis!l-[2,5-dimethyl-4-phenylindenyl]}zirconium dichloride 15 70 46 40.0 0.87 0 0 60 - 17 60 31 151.5 4.89 0 35 60/90 4.0/1.0 19 60 30 149.5 4.98 0 35 60/90 4.1/0.9 20 60 30 140.4 4.68 0 35 60/90 3.6/1.4 21 60 46 109.7 2.38 20 0 60 - 22 60 45 82.4 1.83 10 0 60 _ TABLE 3A Dimethylsilanediylbis{l-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride RUN # T TEEMMPP C Caatt. Ϋ Ylieeϊldd E Effffiicciieennccyy Ϊ HT 22 T Tiimmee Q 2 =/Q^__ (°C) Amount (g) (Kg/g cat) (delta psi) split flow rates (mg) (min.) (1/min.) 23 70 46 47.1 1.02 0 60 - 24 70 32 274.6 8.58 35 60 - 25 70 21 194.9 9.28 35 60 - 26 60 21 203.4 9.69 35 60/90 4.0/1.0 27 60 20 209.9 10.50 35 60/90 4.1/0.9 28 60 21 177.9 8.48 35 60/90 3.6/1.4 29 60 20 156.5 7.83 40 60/90 4.0/1.0 30 70 20 118.6 5.93 40 60 . TABLE 3B Dimethylsilanediylbis {l-[2,5-dimethyl-4-(3,5-dimethylphenyl)indenyl]}zirconium dichloride RUN # Total Ethylene Ethylene in Total Final MFR Melting Point MW MWD IV of (wt %) Rubber (wt%) Rubber (g/10 min.) (°C) (X 10 '3 ) Copolyn (wt %) (dl/g) 23 - - - 0.007 151.57 993.9 2.14 - 24 - - ' - 2.77 152.03 339.6 6.04 - 25 - - - 0.033 151.37 499.5 3.41 - 26 6.111 47.50 12.9 1.65 152.37 310.6 5.22 2.23 27 7.413 50.01 14.8 1.87 151.97 299.7 5.10 2.71 28 4.154 36.35 11.4 5.82 152.17 230.2 5.26 1.99 29 6.052 46.16 13.1 1041 151.43 181.8 6.73 2.21 30 - - - 3.05 151.23 326.9 8.97 - TABLE 4A Dimethylsilanediylbis{l-[2,5-dimethyl-4-(3,5-di-tert-butylphenyl)indenyl]}zirconium dichloride RUN # TEMP. Cat. Yield Efficiency C 2 = H 2 Time (°C) Amount lit c 2 = /c 3 = (g) (Kg/g cat) (delta psi) (delta psi) sp flow rates (mg) (min.) (1/min.) 31 70 46 17.7 0.36 0 0 60 32 70 32 107.3 3.35 0 35 60 - 33 60 32 115.5 3.61 0 35 60/90 4.0/1.0 34 60 32 115.7 3.62 0 35 60/90 4.1/0.9 35 60 31 107.3 3.46 0 35 60/90 3.6/1.4 36 60 46 45.1 0.98 10 0 60 - 37 60 45 70.2 1.56 20 0 60 - TABLE 4B Dimethylsilanediylbis{l-[2,5-dimethyl-4-(3,5-di-tert-butyIphenyl)indenyl]}zirconium dichloride RUN # Total Ethylene Ethylene in Total Final MFR Melting Point MW MWD IV of (wt %) Rubber (wt%) Rubber (g/10 min.) (°C) (X 10 "3 ) Copolymer (wt %) (dl/g) 31 0.197 152.70 550.3 2.06 32 - - - 152.28 150.77 135.3 4.52 - 33 6.344 36.81 17.2 169.18 150.83 122.3 5.26 1.67 34 7.205 38.83 18.6 73.99 151.37 150.4 4.42 1.65 35 4.768 21.55 27.1 146.58 150.43 120.2 4.34 1.79 36 1.0 - - 0.25 143.57 496.9 2.61 - 37 1.8 - - 0.29 139.17 473.2 2.57 -

Claims: WHAT IS CLAIMED IS: 1. A compound represented by the formula: wherein: M 1 is selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten; R 1 and R 2 are selected from hydrogen, halogen, hydroxy, Cι-Cι 0 alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -C 14 aryloxy groups, C 2 -Cιo alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 7 -C 0 arylalkenyl groups; or R 1 and R 2 are joined together to form a C 4 -C 40 alkanediyl group or a conjugated C 4 -C 40 diene ligand which is coordinated to M 1 in a metallacyclopentene fashion; or R 1 and R 2 represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not counting hydrogen and forming a π complex with M 1 ; R 3 is selected from hydrogen, halogen, Ci-Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 0 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR 2 , -SR, -OR', -SiR 3 , -OSiR 3 and -PR radicals wherein each R is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; R 4 , R and R 7 are each independently selected from hydrogen, halogen, Cj- Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 40 arylalkyl groups, C -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and - NR 2 , -SR, -OR, -SiR' 3 , -OSiR 3 and -PR' 2 radicals wherein each R is independently selected from halogen, Cι-Cι 0 alkyl groups and C 6 - 4 aryl groups; or R 6 and R 7 together with the atoms connecting them may form one or more rings; R 5 is selected from halogen, Ci- o alkyl groups, C 6 -Cj 4 aryl groups, C 2 - Cio alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 - C 40 arylalkenyl groups, and -NR' 2 , -SR, -OR', -SiR 3 , -OSiR 3 and -PR 2 radicals wherein each R' is independently selected from halogen, Cι-Cι 0 alkyl groups and C 6 -Cι 4 aryl groups; provided that if R is methyl or F, R 5 is different from R 6 ; R 8 , R 9 , R 10 , R 11 and R 12 are each independently as defined for R 4 , R 6 and R 7 , provided that if R 8 , R 9 , R 11 and R 12 all are hydrogen, then at least one of R 3 , R 5 and R 10 is different from methyl, with R 10 being different from hydrogen; and further provided that if R 8 , R 10 and R 12 all are hydrogen, R 3 is ethyl and R 5 is methyl, then at least one of R 9 and R 11 is different from methyl; R 13 is selected from I | I I 1 -M 3 - -M 3 - - M 3 - -0-M 3 -0- -B(R 14 )-, -A1(R 14 )-, -Ge-, -Sn-, -O-, -S-, -SO-, -SO 2 -, -N(R 14 )-, -CO-, - P(R 14 )- -P(O)(R 14 )-, -B(NR 14 R 15 )- and -B[N(SiR 14 R ,5 R 16 ) 2 ]-; wherein: R 14 , R 15 and R 16 are each independently selected from hydrogen, halogen, Cι-C 2 o alkyl groups, C 6 -C 30 aryl groups, C]-C 2 o alkoxy groups, C 2 -C 20 alkenyl groups, C -C 40 arylalkyl groups, C 8 -C 40 arylalkenyl groups and C 7 - C 40 alkylaryl groups, or R 14 and R 15 , together with the atom(s) connecting them, form a ring; and M 3 is selected from carbon, silicon, germanium and tin; or 1 R is represented by the formula wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen, hydroxy, Ci-Cio alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -Cιo alkenyl groups, C 7 -C 0 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 8 -C 0 arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R , including R and R , together with the atoms connecting them, form one or more rings; and M 2 represents one or more carbon atoms, or a silicon, germanium or tin atom. The compound of claim 1, wherein M 1 is selected from titanium, zirconium and hafnium. 1 3. The compound of claim 2, wherein R and R are selected from chlorine, Cι-C 6 alkyl groups, C 6 -Cιo aryl groups, C 7 -Cι arylalkyl groups and C 7 - 2 alkylaryl groups. 4. The compound of claim 2, wherein R 1 and R 2 are methyl groups. 5. The compound of claim 3, wherein R 3 is selected from Cι-C 6 alkyl groups and phenyl. 6. The compound of claim 3, wherein R is selected from Cι-C 4 alkyl groups. 7. The compound of claim 2, wherein R 3 is an isopropyl group. 8. The compound of claim 1, wherein at least one of R 4 and R 8 is hydrogen. 9. The compound of claim 8, wherein R 5 is selected from Cι-C 6 alkyl groups and C 6 -Cιo aryl groups. 10. The compound of claim 5, wherein R 5 is selected from Cι-C alkyl groups and phenyl. 11. The compound of claim 6, wherein R 5 is methyl. 12. The compound of claim 8, wherein R 12 is hydrogen. 13. The compound of claim 9, wherein R 12 is hydrogen and at least one of R and R 1 ' is different from hydrogen . 14. The compound of claim 13, wherein at least one of R 9 and R is a Cι-C 4 alkyl or phenyl group. 15. The compound of claim 10, wherein R 9 and R 11 are selected from methyl and tert-butyl groups. 16. The compound of claim 6, wherein each of R 4 , R 8 and R 12 is hydrogen. 17. The compound of claim 2, wherein R 1 and R 2 are selected from chlorine, methyl, neopentyl and benzyl, R 3 is selected from Cι-C 4 alkyl groups, each of R 4 , R 8 and R 12 is hydrogen, and R 5 is selected from Cι-C 4 alkyl groups and C 6 -Cιo aryl groups. 18. The compound of claim 1, wherein R 3 is selected from branched C 3 -C 4 alkyl groups and R 5 is selected from Cι-C 4 alkyl groups. 19. The compound of claim 8, wherein R 3 is selected from isopropyl, isobutyl, sec-butyl, tert-butyl and phenyl groups, and R 5 is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, phenyl, tolyl, benzyl and naphthyl groups. 20. The compound of claim 2, wherein M 3 is selected from carbon and silicon, and R 14 , R 15 and R i6 are independently selected from Cι-C 4 alkyl groups and C 6 -Cιo aryl groups. 21. The compound of claim 1, wherein M 1 is selected from zirconium and hafnium; R 1 and R 2 are selected from chlorine, Cι-C 4 alkyl groups and C 6 - Cio aryl groups; R is selected from Cι-C 4 alkyl groups and C 6 -Cι 0 aryl groups; R 4 and R 8 are hydrogen; R 6 , R 7 , R 9 , R 10 , R 11 and R 12 are each independently selected from hydrogen and Cι-C 4 alkyl groups; R 5 is selected from Cι-C 6 alkyl groups and C 6 -Cιo aryl groups; and R 13 is selected from di(C 1 -C 4 alkyl)silanediyl, diphenylsilanediyl, (Cι-C 4 alkyl)phenylsilanediyl, diphenylmethanediyl and C 2 -C 4 alkanediyl and alkenediyl radicals and groups of the formula wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen and Cι-C 3 alkyl groups; and M 2 represents a carbon or silicon atom. 22. The compound of claim 17, wherein R 13 is selected from di(Cι-C 4 alkyl)silanediyl, diphenylsilanediyl, (Cι-C 4 alkyl)phenylsilanediyl, C 2 -C 4 alkanediyl and alkenediyl, di(Cι-C 4 alkyl)amidoborane and bis[tri(Cι-C 4 alky l)lsilyl] amidoborane radicals. 23. The compound of claim 1, which comprises not more than 2 % of the meso form. 24. A compound represented by the formula: wherein: M 1 is selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten; R 1 and R 2 are selected from hydrogen, halogen, hydroxy, Ci-Cio alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -Cιo alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 7 -C 40 arylalkenyl groups; or R and R are joined together to form an alkanediyl group or a conjugated C 4 -C 40 diene ligand which is coordinated to M 1 in a metallacyclopentene fashion; or R 1 and R 2 represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not coiinting hydrogen and forming a π complex with M 1 ; R 3 is selected from hydrogen, halogen, Ci- o alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 0 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR 2 , -SR, -OR, -SiR' 3 , -OSiR 3 and -PR' 2 radicals wherein each R is independently selected from halogen, C 1 -C 10 alkyl groups and C 6 -Cι 4 aryl groups; R 4 , R and R 7 are each independently selected from hydrogen, halogen, - C 10 alkyl groups, C 6 -C] 4 aryl groups, C 2 -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C -C 4 o alkylaryl groups, C 8 -C 40 arylalkenyl groups, and - NR 2 , -SR, -OR, -SiR 3 , -OSiR 3 and -PR 2 radicals wherein each R is independently selected from halogen, C 1 -C 10 alkyl groups and C 6 -Cι 4 aryl groups; or R 6 and R 7 together with the atoms com ecting them may form one or more rings; R 5 is selected from halogen, Ci-Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 - C 10 alkenyl groups, C 7 -C 4 o arylalkyl groups, C -C 40 alkylaryl groups, C 8 - C 40 arylalkenyl groups, and -NR 2 , -SR', -OR, -SiR 3 , -OSiR 3 and -PR 2 radicals wherein each R is independently selected from halogen, C 1 -C 10 alkyl groups and C 6 -Cι 4 aryl groups; R 8 , R 9 , R 10 , R 11 and R 12 are each independently as defined for R 4 , R 6 and R 7 , provided that two or more adjacent radicals R 8 , R 9 , R 10 , R 11 and R 12 together with the atoms connecting them may form one or more rings; . R 13 is selected from diphenylsilanediyl, (Cι-C 4 alkyl)phenylsilanediyl, di(Cι-C 4 alkyl)amidoborane and bis[tri(Cι-C 4 alkyl)silyl]amidoborane radicals and groups of the formula wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen, hydroxy, -Cio alkyl groups, Q-Cio alkoxy groups, C 6 -Cι aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -Cι 0 alkenyl groups, C -C 4 o arylalkyl groups, C 7 -C 4 o alkylaryl groups and C 8 -C 4 o arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 , including R 20 and R 21 , together with the atoms connecting them, form one or more rings; and M 2 represents a carbon, silicon or germanium atom. 25. The compound of claim 24, wherein R is selected from Cι-C 6 alkyl groups and phenyl. 26. The compound of claim 24, wherein R is selected from branched Cι-C 4 alkyl groups. 27. The compound of claim 26, wherein R is an isopropyl group. 28. The compound of claim 25, wherein R is selected from Cι-C 6 alkyl groups and C 6 -Cιo aryl groups. 19 29. The compound of claim 25, wherein R is hydrogen. 30. The compound of claim 29, wherein each of R and R is hydrogen. 31. The compound of claim 24, wherein R is selected from groups of the formula wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen and Cι-C 3 alkyl groups; and M 2 represents a carbon or silicon atom. 32. A compound represented by the formula: wherein: M 1 is selected from titanium, zirconium and hafnium; R 1 and R 2 are selected from hydrogen, halogen, hydroxy, Cι-Cι 0 alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -Cιo alkenyl groups, C -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 7 -C 40 arylalkenyl groups, provided that at least one of R 1 and R 2 is different from halogen; or R 1 and R 2 are joined together to form a C -C 40 alkanediyl group or a conjugated C 4 -C 40 diene ligand which is coordinated 1 1 9 to M in a metallacyclopentene fashion; or R and R represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not counting hydrogen and forming a π complex with M ; R is selected from hydrogen, halogen, Ci-Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR 2 , -SR, -OR', -SiR' 3 , -OSiR 3 and -PR' 2 radicals wherein each R is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; R 4 , R 6 and R 7 are each independently selected from hydrogen, halogen, - Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 -C 4 o arylalkenyl groups, and - NR 2 , -SR', -OR, -SiR' 3 , -OSiR 3 and -PR 2 radicals wherein each R' is independently selected from halogen, Ci-Cio alkyl groups and C -Cι 4 aryl groups; or R and R together with the atoms connecting them may form one or more rings; R 5 is selected from halogen, Ci-Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 - Cio alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 - o arylalkenyl groups, and -NR' 2 , -SR, -OR', -SiR 3 , -OSiR' 3 and -PR 2 radicals wherein each R' is independently selected from halogen, Ci- o alkyl groups and C 6 -Cι aryl groups; R 8 , R 9 , R 10 , R 11 and R 12 are each independently as defined for R 4 , R 6 and R 7 , provided that two or more adjacent radicals R 8 , R 9 , R 10 , R u and R 12 together with the atoms connecting them may form one or more rings; R 13 is selected from I I I -M 3 - -M 3 - M 3 - -O-M 3 -O- I I I I I I -M 3 - C - -O-M 3 - C — C — C — -B(R 14 )-, -A1(R 14 )-, -Ge-, -Sn-, -O-, -S-, -SO-, -SO 2 - 5 -N(R 14 )-, -CO- P(R , 1'4N -P(O)(R , 1 1 4 4 )N-, -B(NR . 1 1 4 4 Rr> 1 1 5 3 )- and wherein: R 1 , R 15 and R 16 are each independently selected from hydrogen, halogen, C1-C20 alkyl groups, C 6 -C o aryl groups, Cι-C 2 o alkoxy groups, C 2 -C 2 o alkenyl groups, C -C 0 arylalkyl groups, C 8 -C 4 o arylalkenyl groups and C - C 4 o alkylaryl groups, or R 14 and R 15 , together with the atom(s) connecting them, form a ring; and M 3 is selected from carbon, silicon, germanium and tin; or 1 '-ϊ R is represented by the formula wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen, hydroxy, C1-C 10 alkyl groups, Cι-Cι 0 alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -C J4 aryloxy groups, C 2 -Cι 0 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups and C 8 -C 0 arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 4 90 1 and R , including R and R , together with the atoms connecting them, form one or more rings; and M 2 represents one or more carbon atoms, or a silicon, germanium or tin atom. 33. A catalyst composition comprising the product of a compound of claim 1 and a cocatalyst. 34. The catalyst composition of claim 33, wherein the cocatalyst is selected from compounds comprising non-coordinating anions, alumoxanes and mixtures thereof. 35. The catalyst composition of claim 33, wherein the cocatalyst comprises methylalumoxane. 36. The catalyst composition of claim 34, wherein the cocatalyst comprises a non-coordinating anion. 37. The catalyst composition of claim 36, wherein the non-coordinating anion comprises at least one unit of the formula -B(C 6 F 5 ) . 38. The catalyst composition of claim 33, which further comprises a support material. 39. The catalyst composition of claim 34, which further comprises an inorganic support material. 40. The catalyst composition of claim 39, wherein the support material is selected from silica, alumina, silica-alumina, magnesium chloride and mixtures thereof. 41. The catalyst composition of claim 38, wherein the support material comprises silica having a surface area ranging from 10 to 700 m 2 /g, a total pore volume ranging from 0.1 to 4.0 cc/g and an average particle size ranging from 10 to 500 μm. 42. A catalyst composition comprising the product of a compound of claim 24 and a cocatalyst. 43. The catalyst composition of claim 42, wherein the cocatalyst is selected from compounds comprising non-coordinating anions, alumoxanes and mixtures thereof. 44. The catalyst composition of claim 42, wherein the cocatalyst comprises methylalumoxane. 45. The catalyst composition of claim 43, wherein the cocatalyst comprises a non-coordinating anion. 46. The catalyst composition of claim 45, wherein the non-coordinating anion comprises at least one unit of the formula -B(C 6 F 5 ) 3 . 47. The catalyst composition of claim 42, which further comprises a support material. 48. The catalyst composition of claim 43, which further comprises an inorganic support material. 49. The catalyst composition of claim 48, wherein the support material is selected from silica, alumina, silica-alumina, magnesium chloride and mixtures thereof. 50. The catalyst composition of claim 47, wherein the support material comprises silica having a surface area ranging from 10 to 700 m 2 /g, a total pore volume ranging from 0.1 to 4.0 cc/g and an average particle size ranging from 10 to 500 μm. 51. A catalyst composition comprising the product of a compound of claim 32 and a cocatalyst. 52. A polymerization process comprising contacting, under polymerization conditions, one or more ethylenically unsaturated monomers and a catalyst composition, said catalyst composition comprising the product of a compound represented by formula (I) and a cocatalyst: wherein: M 1 is selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten; R 1 and R 2 are selected from hydrogen, halogen, hydroxy, Ci-Cio alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -C 10 alkenyl groups, C -C 4 o arylalkyl groups, C 7 -C 4 o alkylaryl groups and C 7 - 0 arylalkenyl groups; or R 1 and R 2 are joined together to form a C 4 -C 4 o alkanediyl group or a conjugated C -C 4 o diene ligand which is 1 1 coordinated to M in a metallacyclopentene fashion; or R and R represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not counting hydrogen and forming a π complex with M 1 ; R 3 is selected from hydrogen, halogen, C 1 - 0 alkyl groups, C 6 -Cι 4 aryl groups, C 2 -C 10 alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR 2 , -SR, -OR, -SiR 3 , -OSiR 3 and -PR' 2 radicals wherein each R' is independently selected from halogen, C 1 -C 10 alkyl groups and C 6 -Cι 4 aryl groups; R 4 , R 6 and R 7 are each independently selected from hydrogen, halogen, - C 10 alkyl groups, C 6 -Cι 4 aryl groups, C2-C 10 alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and - NR 2 , -SR, -OR, -SiR 3 , -OSiR' 3 and -PR 2 radicals wherein each R' is independently selected from halogen, Ci- o alkyl groups and C 6 -Cι 4 aryl groups; or R 6 and R 7 together with the atoms connecting them may form one or more rings; R 5 is selected from halogen, C 1 -C 10 alkyl groups, C 6 -Cι 4 aryl groups, C 2 - C 10 alkenyl groups, C 7 -C 0 arylalkyl groups, C 7 -C 0 alkylaryl groups, C 8 - C 40 arylalkenyl groups, and -NR' 2 , -SR, -OR, -SiR 3 , -OSiR 3 and -PR 2 radicals wherein each R! is independently selected from halogen, C1-C10 alkyl groups and C 6 -Cι 4 aryl groups; provided that if R 6 is methyl or F, R 5 is different from R 6 ; R 8 , R 9 , R 10 , R 11 and R 12 are each independently as defined for R 4 , R 6 and R 7 , provided that if R 8 , R 9 , R 11 and R 12 all are hydrogen, then at least one of R 3 , R 5 and R 10 is different from methyl, with R 10 being different from hydrogen; and further provided that if R 8 , R 10 and R 12 all are hydrogen, R 3 is ethyl and R 5 is methyl, then at least one of R 9 and R 11 is different from methyl; R is selected from R14 R14 R14 R14 I | I ) I I -M 3 - -M 3 - M 3 - -O-M 3 -O- I 1 I I I I I I I I I M 3 - C - -O-M 3 - - C — C - C — -B(R 14 )-, -A1(R 14 )-, -Ge-, -Sn-, -O-, -S-, -SO-, -SO 2 -, -N(R 14 )-, -CO-, - P(R 14 )- -P(O)(R 14 )-, -B(NR 14 R 15 )- and -B[N(SiR 14 R 15 R 16 ) 2 ]-; wherein: R , R 15 and R 16 are each independently selected from hydrogen, halogen, Cι-C 20 alkyl groups, C 6 -C 30 aryl groups, C1-C20 alkoxy groups, C 2 -C 20 alkenyl groups, C 7 -C 40 arylalkyl groups, C 8 -C 4 o arylalkenyl groups and C 7 - C 40 alkylaryl groups, or R 14 and R 15 , together with the atom(s) connecting them, form a ring; and M is selected from carbon, silicon, germanium and tin; or 1 R is represented by the formula wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen, hydroxy, Ci-Cio alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι 4 aryloxy groups, C -Cιo alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 4 o alkylaryl groups and C 8 -C 4 o arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R , including R and R , together with the atoms connecting them, form one or more rings; and M 2 represents one or more carbon atoms, or a silicon, germanium or tin atom. 53. The process of claim 52, wherein M rl : i.s- selected from titanium, zirconium and hafnium. 54. The process of claim 53, wherein R 1 and R 2 are selected from chlorine, - C 6 alkyl groups, C 6 -Cι 0 aryl groups, C 7 -Cι 2 arylalkyl groups and C 7 -Cι 2 alkylaryl groups. 55. The process of claim 54, wherein R 3 is selected from Cι-C 6 alkyl groups and phenyl. 56. The process of claim 53, wherein R 3 is an isopropyl group. 57. The process of claim 52, wherein at least one of R 4 and R is hydrogen. 58. The process of claim 57, wherein R 5 is selected from Cι-C 6 alkyl groups and C 6 -Cιo aryl groups. 59. The process of claim 55, wherein R 5 is selected from Cι-C 4 alkyl groups and phenyl. 10 60. The process of claim 59, wherein R is hydrogen. 61. The process of claim 58, wherein R 12 is hydrogen and at least one of R 9 and R 1 ! is different from hydrogen . 62. The process of claim 61 , wherein at least one of R 9 and R 11 is a Cι-C 4 alkyl or phenyl group. 63. The process of claim 61, wherein R 9 and R 11 are selected from methyl and tert-butyl groups. 64. The process of claim 52, wherein each of R , R and R , 12 is hydrogen. 1 0 65. The process of claim 53, wherein R and R are selected from chlorine, methyl, neopentyl and benzyl, R 3 is selected from Cι-C 4 alkyl groups, each of R 4 , R 8 and R 12 is hydrogen, and R 5 is selected from Cι-C 4 alkyl groups and C 6 -Cιo aryl groups. 66. The process of claim 54, wherein M 3 is selected from carbon and silicon, and R 14 , R 15 and R 16 are independently selected from Cι-C alkyl groups and C 6 -Cιo aryl groups. 67. The process of claim 52, wherein the compound of formula (I) comprises not more than 2 % of the meso form. 68. The process of claim 52, wherein the cocatalyst is selected from compounds comprising non-coordinating anions, alumoxanes and mixtures thereof. 69. The process of claim 54, wherein the cocatalyst comprises methylalumoxane. 70. The process of claim 54, wherein the cocatalyst comprises a non- coordinating anion. 71. The process of claim 70, wherein the non-coordinating anion comprises at least one unit of the formula -B(C 6 F 5 ) 3 . 72. The process of claim 52, wherein the catalyst composition further comprises a support material. 73. The process of claim 59, wherein the catalyst composition further comprises an inorganic support material. 74. The process of claim 72, wherein the support material is selected from silica, alumina, silica-alumina, magnesium chloride and mixtures thereof. 75. The process of claim 52, wherein said one or more ethylenically unsaturated monomers are selected from monoolefins, diolefins and mixtures thereof. 76. The process of claim 75, wherein said monoolefins comprise compounds of the formula R a CH=CHR b wherein R a and R b are each independently selected from hydrogen, alkyl and alkenyl radicals having 1 to 14 carbon atoms or, together with the carbon atoms to which they are connected, form a ring having 4 to 8 carbon atoms. 77. The process of claim 75, wherein said monoolefins are selected from ethylene and α-olefins having from 3 to 12 carbon atoms. 78. The process of claim 77, wherein said α-olefins are selected from propylene, 1-butene, 4-methyl-l-pentene, 1-hexene, 1-octene and mixtures thereof. 79. The process of claim 52, wherein said ethylenically unsaturated monomers consist essentially of ethylene and propylene. 80. The process of claim 52, wherein said process is carried out at a temperature ranging from 30° C to 80° C. 81. The process of claim 80, wherein said process is carried out at a pressure ranging from 5 to 64 bar. 82. The process of claim 52, wherein R 1 and R 2 are selected from chlorine, Cj- C 6 alkyl groups, C 6 -Cιo aryl groups, C 7 -Cι 2 arylalkyl groups and C -Cι 2 alkylaryl groups, R 3 is selected from Cι-C 6 alkyl groups and phenyl, each of R 4 , R 8 and R 12 is hydrogen, R 5 is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, phenyl, tolyl, benzyl and naphthyl groups, the cocatalyst is selected from compounds comprising non-coordinating anions, alumoxanes and mixtures thereof, wherein the catalyst composition further comprises a support material selected from silica, alumina, silica-alumina, magnesium chloride and mixtures thereof, and wherein said one or more ethylenically unsaturated monomers comprise at least ethylene and propylene. 83. A polymerization process comprising contacting, under polymerization conditions, one or more ethylenically imsaturated monomers and a catalyst composition, said catalyst composition comprising the product of a compound represented by formula (I) and a cocatalyst: wherein: M 1 is selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten; R and R are selected from hydrogen, halogen, hydroxy, Ci-Cio alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι aryloxy groups, C 2 -Cιo alkenyl groups, C 7 -C o arylalkyl groups, C 7 -C 40 alkylaryl groups and C 7 -C 4 o arylalkenyl groups; or R 1 and R 2 are joined together to form an alkanediyl group or a conjugated C 4 -C 4 o diene ligand which is coordinated ι 1 0 to M in a metallacyclopentene fashion; or R and R represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not counting hydrogen and forming a π complex with M 1 ; R is selected from hydrogen, halogen, Ci- o alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Ci 0 alkenyl groups, C 7 -C 0 arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR' 2 , -SR, -OR, -SiR 3 , -OSiR 3 - l ό l - and -PR' 2 radicals wherein each R' is independently selected from halogen, Ci-Cio alkyl groups and C 6 - 4 aryl groups; R 4 , R 6 and R 7 are each independently selected from hydrogen, halogen, Cj- Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 40 arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 -C 4 o arylalkenyl groups, and - NR 2 , -SR', -OR', -SiR' 3 , -OSiR' 3 and -PR' 2 radicals wherein each R' is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; or R and R together with the atoms comiecting them may form one or more rings; R 5 is selected from halogen, -Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 - Cio alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 40 alkylaryl groups, C_- C 40 arylalkenyl groups, and -NR , -SR, -OR', -SiR 3 , -OSiR' 3 and -PR' 2 radicals wherein each R is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; R 8 , R 9 , R 10 , R n and R 12 are each independently as defined for R 4 , R 6 and R 7 , provided that two or more adjacent radicals R 8 , R 9 , R 10 , R 11 and R 12 together with the atoms connecting them may form one or more rings; R 13 is selected from diphenylsilanediyl, ( -C 4 alkyl)phenylsilanediyl, di( -C 4 alkyl)amidoborane and bis[tri(Cι-C 4 alkyl)silyl]amidoborane radicals and groups of the formula: wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen, hydroxy, Cr o alkyl groups, Ci-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 - 4 aryloxy groups, C 2 -Cιo alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 4 o alkylaryl groups and C 8 -C 40 arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 o-d. n o i and R , including R and R , together with the atoms connecting them, form one or more rings; and M 2 represents a carbon, silicon or germanium atom. 84. The process of claim 83, wherein R is selected from Cι-C 6 alkyl groups and phenyl. 85. The process of claim 84, wherein R is an isopropyl group. 86. The process of claim 84, wherein R is selected from Cι-C 6 alkyl groups and C 6 -Cιo aryl groups. 87. The process of claim 86, wherein R 12 i •s hydrogen. 88. The process of claim 86, wherein each of R 4 and R 8 is hydrogen. 89. The process of claim 83, wherein the cocatalyst is selected from compounds comprising non-coordinating anions, alumoxanes and mixtures thereof. 90. The process of claim 89, wherein the non-coordinating anion comprises at least one unit of the formula -B(C 6 F 5 ) 3 . 91. The process of claim 83, wherein the cocatalyst is selected from compounds comprising non-coordinating anions, alumoxanes and mixtures thereof. 92. The process of claim 83, wherein said one or more ethylenically unsaturated monomers are selected from monoolefins, diolefins and mixtures thereof. 93. The process of claim 92, wherein said monoolefins comprise compounds of the formula R a CH=CHR b wherein R a and R are each independently selected from hydrogen, alkyl and alkenyl radicals having 1 to 14 carbon atoms or, together with the carbon atoms to which they are connected, form a ring having 4 to 8 carbon atoms. 94. The process of claim 92, wherein said monoolefins are selected from ethylene, propylene, 1-butene, 4-methyl-l-pentene, 1-hexene, 1-octene and mixtures thereof. 95. The process of claim 89, wherein said ethylenically unsaturated monomers consist essentially of ethylene and propylene. 96. A polymerization process comprising contacting, under polymerization conditions, one or more ethylenically unsaturated monomers and a catalyst composition, said catalyst composition comprising the product of a compound represented by formula (I) and a cocatalyst: wherein: M 1 is selected from titanium, zirconium and hafnium; R 1 and R 2 are selected from hydrogen, halogen, hydroxy, Cj-Cio alkyl groups, CpCio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι 4 aryloxy groups, C -Cιo alkenyl groups, C 7 -C o arylalkyl groups, C -C 40 alkylaryl groups and C 7 -C 4 o arylalkenyl groups, provided that at least one of R 1 and R 2 is 1 0 different from halogen; or R and R are joined together to form a C 4 -C 40 alkanediyl group or a conjugated C 4 -C 40 diene ligand which is coordinated to M 1 in a metallacyclopentene fashion; or R 1 and R 2 represent a conjugated diene, optionally substituted with one or more groups independently selected from hydrocarbyl, trihydrocarbylsilyl and trihydrocarbylsilylhydrocarbyl groups, said diene having a total of up to 40 atoms not counting hydrogen and forming a π complex with M 1 ; R is selected from hydrogen, halogen, Cι-Cι 0 alkyl groups, C 6 -Cι aryl groups, C 2 -Cιo alkenyl groups, C 7 -C 0 arylalkyl groups, C 7 -C o alkylaryl groups, C 8 -C 40 arylalkenyl groups, and -NR' 2 , -SR, -OR, -SiR' 3 , -OSiR' 3 and -PR' 2 radicals wherein each R is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; R , R and R are each independently selected from hydrogen, halogen, C \ - Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 -Cι 0 alkenyl groups, C -C o arylalkyl groups, C 7 -C 40 alkylaryl groups, C 8 -C 40 arylalkenyl groups, and - NR' 2 , -SR', -OR, -SiR' 3 , -OSiR' 3 and -PR' 2 radicals wherein each R is independently selected from halogen, Ci-Cio alkyl groups and C 6 -Cι 4 aryl groups; or R 6 and R 7 together with the atoms connecting them may form one or more rings; R 5 is selected from halogen, -Cio alkyl groups, C 6 -Cι 4 aryl groups, C 2 - Cio alkenyl groups, C 7 -C 4 o arylalkyl groups, C 7 -C 4 o alkylaryl groups, C 8 - C 40 arylalkenyl groups, and -NR 2 , -SR, -OR, -SiR 3 , -OSiR 3 and -PR 2 radicals wherein each R is independently selected from halogen, Q-Cio alkyl groups and C 6 -Cι 4 aryl groups; R 8 , R 9 , R 10 , R 11 and R 12 are each independently as defined for R 4 , R 6 and 7 R Q 10 1 1 10 R , provided that two or more adjacent radicals R , R , R , R and R together with the atoms connecting them may form one or more rings; R 13 is selected from I I I -M 3 - -M 3 - M 3 - -O-M 3 -O- I I I I I I -M 3 - C - -O-M 3 - - C — C — C — R I 15 RI 16 R I 15 R I 15 RI 15 RI 15 -B(R 14 )-, -A1(R 14 )-, -Ge-, -Sn-, -O-, -S-, -SO-, -SO 2 -, -N(R 14 )-, -CO-, P(R 14 )- -P(O)(R 14 )-, -B(NR 14 R 15 )- and -B[N(SiR 14 R 15 R 16 ) 2 ]-; wherein: R 14 , R 15 and R 16 are each independently selected from hydrogen, halogen, Cι-C o alkyl groups, C 6 -C 30 aryl groups, Cι-C 20 alkoxy groups, C 2 -C 20 alkenyl groups, C -C 40 arylalkyl groups, C 8 -C 4 o arylalkenyl groups and C - C 40 alkylaryl groups, or R 14 and R 15 , together with the atom(s) connecting them, form a ring; and M 3 is selected from carbon, silicon, germanium and tin; or 1 " R is represented by the formula wherein: R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 are each independently selected from hydrogen, halogen, hydroxy, Ci-Cio alkyl groups, Cj-Cio alkoxy groups, C 6 -Cι 4 aryl groups, C 6 -Cι 4 aryloxy groups, C 2 -Cιo alkenyl groups, C -C 40 arylalkyl groups, C 7 -C 4 o alkylaryl groups and C 8 -C 40 arylalkenyl groups; or two or more adjacent radicals R 17 , R 18 , R 19 , R 20 , R 21 , R 22 , R 23 and R 24 , including R 20 and R 21 , together with the atoms connecting them, form one or more rings; and M 2 represents one or more carbon atoms, or a silicon, germanium or tin atom. 97. The process of claim 96, wherein the cocatalyst is selected from compounds comprising non-coordinating anions, alumoxanes and mixtures thereof. 98. The process of claim 97, wherein the cocatalyst is selected from compounds comprising non-coordinating anions, alumoxanes and mixtures thereof. 99. The process of claim 98, wherein said ethylenically unsaturated monomers consist essentially of ethylene and propylene.

Inventors: BURKHARDT TERRY J, HART JAMES R, HAYGOOD WILLIAM T, LI ROBERT T, BURKHARDT, TERRY, J., HART, JAMES, R., HAYGOOD, WILLIAM, T., LI, ROBERT, T.
Applicants: BURKHARDT TERRY J, EXXONMOBIL CHEM PATENTS INC, HART JAMES R, HAYGOOD WILLIAM T, LI ROBERT T, BURKHARDT, TERRY, J., EXXONMOBIL CHEMICAL PATENTS INC., HART, JAMES, R., HAYGOOD, WILLIAM, T., LI, ROBERT, T.
Application year: 2001
Main classification: C07F17
IPC codes: C07F7, C07F17, C08F4, C08F10, C08F210