Patent Description:
The present invention relates to a ligand compound having a novel structure, a transition metal compound, and a catalyst composition including the same.

Transition metal pincer complexes have been widely applied in the field of organometallic catalysis. Tridentate chelating pincer ligands are combined with a metal to form a planar structure with the metal at the center. Ligand-metal interaction is rigid and inflexible, and thus, high stability is provided.

For homogeneous olefin polymerization, the initial Zr-based metallocene catalyst developed into Ti-based half-metallocene, and finally to a post-metallocene having a bicyclopentadienyl ligand. Among the post-metallocenes developed, the pincer-type [Cnaphthyl, Npyridine, Namido]HfMe<NUM> complex is a main catalyst. This complex has been developed in the early <NUM> through high-throughput screening and has been extensively researched, and is applied in commercial processes.

Such a complex may introduce a large amount of alpha-olefin in an ethylene/alpha-olefin copolymerization, and may control the tacticity of propylene polymerization for preparing isotactic polypropylene. Another advantage of the this complex is the lack of β-elimination process, which is a unique chain transfer reaction inevitable in olefin polymerization using the conventional Zr-based metallocene and Ti-based half-metallocene catalysts. Due to such characteristics, a polyolefin chain may be grown from an Hf-site, and transferred to a chain transfer agent such as diethylzinc(Et2Zn) to grow uniform polyolefin chains. Such a process is referred to as coordinative chain transfer polymerization (CCTP). CCTP technique may be utilized for the commercial production of an olefin block copolymer.

In addition, a polyolefin-polystyrene block copolymer may be synthesized through the anionic polymerization of styrene using a complex in a reaction after CCTP. As described above, a transition metal compound including a hafnium metal may be useful as a catalyst for producing olefin based polymers, and a great deal of research for improving catalyst performance by modifying thereof is being conducted.

Transition metal compounds as catalysts with related structures are known from the prior art. For example, <CIT> describes the following compound:
<CHM>.

<CIT> describes the following compound:
<CHM>.

<CIT> describes the following compounds:
<CHM>
<CHM>.

<CIT> describes the preparation of a zirconium complex using the following ligand compound:
<CHM>.

<CIT> describes the following catalyst:
<CHM>.

Further documents describing similar compounds include <CIT>, <CIT>, <CIT>, and the articles of <NPL> and by <NPL>.

An object of the present invention is to provide a novel transition metal compound, a ligand compound and a catalyst composition including the same.

In order to solve the above-described tasks, the present invention provides a transition metal compound represented by the following Formula 1a:
<CHM>
in Formula 1a,.

In addition, an embodiment of the present invention provides a catalyst composition including the transition metal compound represented by Formula 1a and a cocatalyst.

In addition, an embodiment of the present invention provides a method for preparing on olefin polymer, including polymerizing an olefin monomer in the presence of the catalyst composition.

The novel transition metal compound of the present invention may be useful as a catalyst of polymerization reaction for preparing an olefin polymer having a high molecular weight.

In the present invention, "alkyl" means a hydrocarbon residue of a linear chain or a branched chain.

In the present invention, "alkenyl" means an alkenyl group of a linear chain or a branched chain.

In the present invention, "aryl" preferably has <NUM> to <NUM> carbon atoms, and particularly includes phenyl, naphthyl, anthracenyl, pyridyl, dimethylanilinyl, anisolyl, etc., without limitation.

In the present invention, "alkylaryl" means an aryl group substituted with the alkyl group.

In the present invention, "arylalkyl" means an alkyl group substituted with the aryl group.

In the present invention, "alkylsilyl" may be silyl substituted with alkyl of <NUM> to <NUM> carbon atoms, for example, trimethylsilyl or triethylsilyl.

In the present invention, "alkylamino" means an amino group substituted with the alkyl group and includes a dimethylamino group, a diethylamino group, etc., but is not limited thereto.

In the present invention, "hydrocarbyl" means a monovalent hydrocarbon group of <NUM> to <NUM> carbon atoms, composed of only carbon and hydrogen irrespective of its structure, including alkyl, aryl, alkenyl, alkynyl, cycloalkyl, alkylaryl or arylalkyl.

If polymerization reaction is performed in the presence of an excessive amount of a chain transfer agent (for example, (Et)<NUM>Zn) with respect to a catalyst, an olefin polymer chain may undergo rapid transalkylation between zinc (Zn) and hafnium (Hf) for uniform propagation from dialkylzinc to accomplish living polymerization, and this is referred to as coordinative chain transfer polymerization (CCTP). The conventionally used metallocene catalysts precluded living polymerization due to a β-elimination process, and a small number of catalysts well-known as being applicable to CCTP enabled only homopolymerization of ethylene but made the copolymerization of ethylene and alpha-olefin through CCTP very difficult. Accordingly, the living polymerization through CCTP using a common transition metal compound as a catalyst to prepare a block copolymer was difficult.

The transition metal compound of the present invention is characterized in including a bulky functional group for R<NUM> in Formula 1a, and through this, high catalyst activity was accomplished. In case of positioning a functional group having a small size, for example, an isopropyl group, for R<NUM>, the isopropyl group and a hafnium compound may react, and catalyst deactivation reaction may be carried out, on the contrary, the functional group positioned at R<NUM> effectively reduces the deactivation reaction of the compound of the present invention and improves stability, as well as reducing the activation energy in polymerization reaction and showing excellent catalyst activity.

As described above, the transition metal compound of the present invention may be usefully used as a catalyst for preparing an olefin polymer, and this is intrinsic characteristic accomplished by the novel structure of the compound newly developed in the present invention.

Particularly, in Formula 1a, M may be Hf.

Particularly, in Formula 1a, R<NUM> and R<NUM> may be each independently hydrogen; or a substituted or unsubstituted aryl group of <NUM> to <NUM> carbon atoms, where the substitution is conducted with an alkyl group of <NUM> to <NUM> carbon atoms.

Particularly, in Formula 1a, each R<NUM> may be independently a cycloalkyl group of <NUM> to <NUM> carbon atoms; or an aryl group of <NUM> to <NUM> carbon atoms.

Particularly, in Formula <NUM>, Y<NUM> and Y<NUM> may be each independently an alkyl group of <NUM> to <NUM> carbon atoms.

The transition metal compound represented by Formula <NUM> may particularly be selected from the compounds below, but all transition metal compounds corresponding to Formula 1a are included in the present invention, without limitation. <CHM>
<CHM>
<CHM>.

In addition, the present invention provides a ligand compound represented by the following Formula <NUM>:
<CHM>
<CHM>
in Formula <NUM>,.

That is, the transition metal compound of the present invention may be prepared by including: reacting a ligand compound represented by the following Formula <NUM> and a compound represented by the following Formula <NUM>:
<CHM>.

[Formula <NUM>]     M(Y<NUM>Y<NUM>)<NUM>.

in the above formulae,
R<NUM> to R<NUM>, M, Y<NUM> and Y<NUM> are the same as defined above.

Meanwhile, when preparing the transition metal compound represented by Formula 1a of the present invention, reaction may be performed by a process below. <CHM>
<CHM>
<CHM>.

The catalyst composition of the present invention is characterized in including the transition metal compound represented by Formula 1a and a cocatalyst.

In the present invention, the "composition" includes a mixture of materials including a corresponding composition as well as a reaction product and decomposition product formed from the materials of the corresponding composition.

The cocatalyst may use any one well-known in the art, for example, one or more selected among the following Formulae <NUM> to <NUM> may be used as the cocatlyst:.

[Formula <NUM>]     [L-H]+[Z(A)<NUM>]- or [L]+[Z(A)<NUM>]-.

The compound represented by Formula <NUM> is not specifically limited as long as it is alkylaluminoxane. Preferable examples may include methylaluminoxane, ethylaluminoxane, isobutylaluminoxane, butylaluminoxane, etc., particularly preferably, methylaluminoxane.

The compound represented by Formula <NUM> is not specifically limited, and preferable examples thereof may include trimethylaluminum, triethylaluminum, triisobutylaluminum, tripropylaluminum, tributylaluminum, dimethylchloroaluminum, tri-s-butylaluminum, tricyclopentylaluminum, tripentylaluminum, triisopentylaluminum, trihexylaluminum, trioctylaluminum, ethyldimethylaluminum, methyldiethylaluminum, triphenylaluminum, tri-p-tolylaluminum, dimethylaluminummethoxide, dimethylaluminumethoxide, trimethylboron, triethylboron, triisobutylboron, tripropylboron, tributylboron, etc., and particularly preferably, be selected from trimethylaluminum, triethylaluminum, and triisobutylaluminum.

Examples of the compound represented by Formula <NUM>, if Z is boron, may include, for example, dioctadecylmethylammonium tetrakis(pentafluorophenyl)borate [(C<NUM>H<NUM>)<NUM>N(H)Me]+[B(C<NUM>F<NUM>)<NUM>]-, dioctadecylmethylammonium tetrakis(phenyl)borate, dioctadecylmethylammonium tetrakis[<NUM>,<NUM>-bis(trifluoromethyl)phenyl]borate, triethylammonium tetraphenylborate, tributylammonium tetraphenylborate, trimethylammonium tetraphenylborate, tripropylammonium tetraphenylborate, trimethylammonium tetra(p-tolyl)borate, trimethylammonium tetra(o,p-dimethylphenyl)borate, tributylammonium tetra(p-trifluoromethylphenyl) borate, trimethylammonium tetra(p-trifluoromethylphenyl) borate, tributylammonium tetrapentafluorophenylborate, N,N-diethylanilidium tetraphenylborate, N,N-diethylanilinium tetrapentafluorophenylborate, diethylammonium tetrapentafluorophenylborate, triphenylphosphonium tetraphenylborate, trimethylphosphonium tetraphenylborate, tripropylammonium tetra(p-tolyl)borate, triethylammonium tetra(o,p-dimethylphenyl)borate, trimethylammonium tetra(o,p-dimethylphenyl)borate, triphenylcarbonium tetra(p-trifluoromethylphenyl) borate, triphenylcarbonium tetrapentafluorophenylborate, or combinations thereof, if Z is aluminum, for example, triethylammonium tetraphenylaluminum, tributylammonium tetraphenylaluminum, trimethylammonium tetraphenylaluminum, tripropylammonium tetraphenylaluminum, trimethylammonium tetra(p-tolyl)aluminum, tripropylammonium tetra(p-tolyl)aluminum, triethylammonium tetra (o,p-dimethylphenyl) aluminum, tributylammonium tetra(p-trifluoromethylphenyl)aluminum, trimethylammonium tetra(p-trifluoromethylphenyl)aluminum, tributylammonium tetrapentafluorophenylaluminum, N,N-diethylanilinium tetraphenylaluminum, N,N-diethylanilinium tetrapentafluorophenylaluminum, diethylammonium tetrapentafluorophenylaluminum, triphenylphosphonium tetraphenylaluminum, trimethylphosphonium tetraphenylaluminum, triethylammonium tetraphenylaluminum, tributylammonium tetraphenylaluminum, or combinations thereof, without limitation.

Particularly, the cocatalyst used in the present invention may be the compound represented by Formula <NUM>, particularly, dioctadecylmethylammonium tetrakis(pentafluorophenyl)borate.

In addition, the transition metal compound represented by Formula <NUM> and the cocatalyst may be used in a supported type by a support. Silica or alumina may be used as the support, without limitation.

The method for preparing an olefin polymer of the present invention is characterized in including a step of polymerizing an olefin monomer in the presence of the catalyst composition.

In the present invention, the "polymer" refers to a polymer compound prepared by polymerizing monomers of the same or different types. Such a general term of polymer includes the term of homopolymer used for referring to a polymer prepared from only one type of monomer and the term of interpolymer specified as follows.

In the present invention, the term "interpolymer" refers to a polymer prepared by polymerizing at least two different types of monomers. Like this, a general term of interpolymer refers to a polymer prepared from two different types of monomers and includes a commonly used copolymer and a polymer prepared from two or more different types of monomers.

In the present invention, the olefin monomer may be one or more selected from the group consisting of ethylene, propylene, <NUM>-butene, <NUM>-pentene, <NUM>-methyl-<NUM>-pentene, <NUM>-hexene, <NUM>-heptene, <NUM>-octene, <NUM>-decene, <NUM>-undecene, <NUM>-dodecene, <NUM>-tetradecene, <NUM>-hexadecene and <NUM>-eicosene, without limitation.

Particularly, the olefin polymer of the present invention may be an olefin homopolymer, or an olefin-alpha-olefin copolymer according to the type of the olefin monomer, and preferably, may be an ethylene/alpha-olefin copolymer. In this case, the amount of the alpha-olefin monomer, which is a comonomer, may be suitably selected according to the use, purpose, etc., of the olefin polymer by a person skilled in the art, and may be about <NUM> to <NUM> mol%.

The catalyst composition may be injected after being dissolved or diluted in an aliphatic hydrocarbon solvent of <NUM> to <NUM> carbon atoms such as pentane, hexane, heptane, nonane, decane, isomers thereof, an aromatic hydrocarbon solvent such as toluene and benzene, or a hydrocarbon solvent substituted with a chlorine atom such as dichloromethane and chlorobenzene, which are suitable for an olefin polymerization process. The solvent used herein may preferably be used after removing a small amount of water or air, which functions as a catalyst poison, by treating with a small amount of alkylaluminum, and may be treated by further using a cocatalyst.

The most preferable preparation process using the catalyst composition is a solution process, and if the composition is used together with an inorganic support such as silica, it may also be applied to a slurry process or a gas phase process.

The polymerization may be performed by homopolymerizing one type of olefin monomer or copolymerizing two or more olefin monomers by using one of a continuous slurry polymerization reactor, a loop slurry reactor, a gas phase reactor, or a solution reactor.

In addition, to remove moisture in the reactor during performing polymerization reaction, an organoaluminum compound may be further injected, and the polymerization reaction may be performed in the presence thereof. Particular examples of such organoaluminum compound may include trialkylaluminum, dialkylaluminum halide, alkylaluminum dihalide, aluminum dialkyl hydride or alkyl aluminum sesquihalide, and more particular examples thereof may include Al(C<NUM>H<NUM>)<NUM>, Al(C<NUM>H<NUM>)<NUM>H, Al(C<NUM>H<NUM>)<NUM>, Al(C<NUM>H<NUM>)<NUM>H, Al(i-C<NUM>H<NUM>) H, Al(C<NUM>H<NUM>)<NUM>, Al(C<NUM>H<NUM>)<NUM>, Al(C<NUM>H<NUM>)(C<NUM>H<NUM>)<NUM>, Al(i-C<NUM>H<NUM>)(C<NUM>H<NUM>)<NUM>, Al(i-C<NUM>H<NUM>)<NUM>H, Al(i-C<NUM>H<NUM>)<NUM>, (C<NUM>H<NUM>)<NUM>AlCl, (i-C<NUM>H<NUM>)<NUM>AlCl or (C<NUM>H<NUM>)<NUM>Al<NUM>Cl<NUM>. Such an organoaluminum compound may be continuously injected to the reactor, or may be injected in a ratio of about <NUM> to <NUM> mol per <NUM> of a reaction medium which is injected to the reactor for suitable removal of moisture.

According to an embodiment of the present invention, the polymerization of the olefin polymer may be performed under conditions of a temperature of about <NUM> to <NUM>, particularly, a temperature of about <NUM> to <NUM>, or a temperature of about <NUM> to <NUM>, and a pressure of about <NUM> to <NUM> bar, particularly, a pressure of about <NUM> to <NUM> bar, or a pressure of about <NUM> to <NUM> bar, for about <NUM> minutes to <NUM> hours.

Hereinafter, the present invention will be explained in more detail referring to the examples. However, the examples are for illustrating the present invention, and the scope of the present invention is not limited thereto.

All experiments were performed under an inert atmosphere using a standard glove box and Schlenk technique. Toluene, hexane, and tetrahydrofuran (THF) were used after distillation from benzophenone ketyl. Methylcyclohexane (anhydrous grade) used in polymerization reaction was used after purchasing from Tokyo Chemical Industry (TCI) and purifying using a Na/K alloy. HfCl<NUM> of a sublimation grade was purchased from Streme and used as it was. An ethylenepropylene gas mixture was purified with trioctylaluminum (<NUM> in a mineral system) in a bomb reactor (<NUM>) and used.

<NUM>H NMR (<NUM>) and <NUM>C NMR (<NUM>) spectrums were recorded using a ECZ <NUM> apparatus (JOEL).

Elemental analysis was performed in the Analysis Center of Ajou University.

GPC data was analyzed in <NUM>,<NUM>,<NUM>-trichlorobenzene at <NUM> using a PL-GPC <NUM> system equipped with a refractive index detector and two columns (Plarian Mixed-B <NUM> x <NUM> Varian [Polymer Lab]).

<NUM>,<NUM>-dicycloheptylaniline (<NUM>, <NUM> mmol) and <NUM>-bromo-<NUM>-pyridinecarboxaldehyde (<NUM>, <NUM> mmol) were dissolved in toluene (<NUM>), and molecular sieves were injected thereto. The mixture was heated to <NUM> overnight while stirring. After filtering, a solvent was removed in a rotary evaporator. A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM>(s, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

HRMS (EI): m/z calcd. ([M+] C<NUM>H<NUM>BrN<NUM>) <NUM>. Found: <NUM>.

Under nitrogen, a Schlenk flask was charged with the compound (<NUM>, <NUM> mmol), <NUM>-naphthylboronic acid (<NUM>, <NUM> mmol), Na<NUM>CO<NUM> (<NUM>, <NUM> mmol) and toluene (<NUM>). A solution of (Ph<NUM>P)<NUM>Pd (<NUM>, <NUM> mmol) in a degassed H<NUM>O-EtOH mixture (<NUM>:<NUM> [v/v], <NUM>) and toluene (<NUM>) was injected. A two-phase solution was heated to <NUM> overnight while stirring. After cooling to room temperature, water (<NUM>) was added, and a product was extracted with toluene (<NUM> x <NUM>). An organic phase collected was dried with anhydrous MgSO<NUM>, and solvents were removed in a rotary evaporator. A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM> (s, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

HRMS (EI): m/z calcd. ([M+] C<NUM>H<NUM>N<NUM>) <NUM>. Found: <NUM>.

<NUM>-isopropylphenyllithium (<NUM>, <NUM> mmol) dissolved in diethyl ether (<NUM>) was added dropwisely to a Schlenk flask including the compound (<NUM>, <NUM> mmol) in diethyl ether (<NUM>). After stirring for <NUM> hours, an aqueous solution (<NUM>) of ammonium chloride (<NUM>) was added thereto, and a product was extracted with diethyl ether (<NUM> x <NUM>). An oil produced was dried overnight at <NUM> in high vacuum. A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>): δ <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(s, <NUM>, NH), <NUM>(septet, J = <NUM>, <NUM>, CH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM><NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

A Schlenk flask was charged with the ligand compound (<NUM>, <NUM> mmol) in toluene (<NUM>), and n-BuLi (<NUM>, a <NUM> solution in hexane, <NUM> mmol) was added thereto dropwisely at room temperature. After stirring for <NUM> hour, HfCl<NUM> (<NUM>, <NUM> mmol) was added thereto as a solid. The reaction mixture was heated at <NUM> and stirred for <NUM> hours. After cooling, MeMgBr (<NUM>, a <NUM> solution in diethyl ether, <NUM> mmol) was injected, followed by stirring at room temperature overnight. A volatile material was removed via a vacuum line, and a product was extracted with toluene (<NUM>). The extract was obtained through celite filtering. After removing a solvent through a vacuum line, the residue was softened in hexane (<NUM>) to obtain a yellow solid (<NUM>, <NUM>%). <NUM>H NMR spectrum and <NUM>C NMR spectrum were analyzed, and the results are shown in <FIG>.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>. <NUM> (d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM> (t, J = <NUM>, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(m, <NUM>), <NUM> (t, J = <NUM>, <NUM>), <NUM>(septet, J = <NUM>, <NUM>, CH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

(C<NUM>H<NUM>HfN<NUM>): C, <NUM>; H, <NUM>; N, <NUM>%. Found: C, <NUM>; H, <NUM>; N, <NUM>%.

Preparation was performed by the same method as in Example <NUM> using <NUM>,<NUM>-dicyclohexylaniline (<NUM>, <NUM> mmol), <NUM>-bromo-<NUM>-pyridinecarboxaldehyde (<NUM>, <NUM> mmol) and toluene (<NUM>). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM>(s, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(quartet, J = <NUM>, <NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR : δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

HRMS (EI): m/z calcd ([M+] C<NUM>H<NUM>BrN<NUM>) <NUM>. Found: <NUM>.

Preparation was performed by the same method as in Example <NUM> using the compound (<NUM>, <NUM> mmol), <NUM>-naphthylboronic acid (<NUM>, <NUM> mmol), Na<NUM>CO<NUM> (<NUM>, <NUM> mmol), toluene (<NUM>), degassed H<NUM>O/EtOH (<NUM>, v/v, <NUM>:<NUM>), and (Ph<NUM>P)<NUM>Pd(<NUM>, <NUM> mmol) in toluene (<NUM>). By column chromatography on silica gel using hexane and ethyl acetate containing a small amount of triethylamine (v/v, <NUM>:<NUM>:<NUM>), a lemon yellow oil (<NUM>, <NUM>%) was obtained.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM> (s, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>. <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

HRMS(EI): m/z calcd([M+] C<NUM>H<NUM>N<NUM>) <NUM>. Found: <NUM>.

Preparation was performed by the same method as in Example <NUM> using the compound (<NUM>, <NUM> mmol) and <NUM>-isopropylphenyllithium (<NUM>, <NUM> mmol). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>, NH), <NUM>(septet, J = <NUM>, <NUM>,CH), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>. <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

HRMS (EI) : m/z calcd ([M+] C<NUM>H<NUM>N<NUM>) <NUM>. Found: <NUM>.

Preparation was performed by the same method as in Example <NUM> using the ligand compound (<NUM>, <NUM> mmol), n-BuLi (<NUM>, a <NUM> solution in hexane, <NUM> mmol), HfCl<NUM> (<NUM>, <NUM> mmol), MeMgBr (<NUM>, a <NUM> solution in diethyl ether, <NUM> mmol) and toluene (<NUM>). A yellow solid was obtained (<NUM>, <NUM>%). <NUM>H NMR spectrum and <NUM>C NMR spectrum were analyzed, and the results are shown in <FIG>.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using <NUM>,<NUM>-dicyclopentylaniline (<NUM>, <NUM> mmol), <NUM>-bromo-<NUM>-pyridinecarboxaldehyde (<NUM>, <NUM> mmol) and toluene (<NUM>). A yellow solid was obtained (<NUM>, <NUM>%). Through recrystallization in hexane and toluene at -<NUM>, an analytically pure compound was obtained.

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM>(s, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>) ppm. <NUM>C NMR (C<NUM>D<NUM>) : δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using the compound (<NUM>, <NUM> mmol), <NUM>-naphthylboronic acid (<NUM>, <NUM> mmol), Na<NUM>CO<NUM> (<NUM>, <NUM> mmol), toluene (<NUM>), degassed H<NUM>O/EtOH (<NUM>, v/v, <NUM>:<NUM>), and a solution of (Ph<NUM>P)<NUM>Pd (<NUM>, <NUM> mmol) in toluene (<NUM>). Through recrystallization in hexane and toluene at -<NUM>, an analytically pure compound was obtained. A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM>(s, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(quintet, d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM> (m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

HRMS (EI): m/z calcd([M+] C<NUM>H<NUM>N<NUM>) <NUM>. Found: <NUM>.

Preparation was performed by the same method as in Example <NUM> using the compound (<NUM>, <NUM> mmol) and <NUM>-isopropylphenyllithium (<NUM>, <NUM> mmol). A lemon yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM> (m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(s, <NUM>, NH), <NUM>(septet, J = <NUM>, <NUM>, CH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C N-MR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM><NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using the ligand compound (<NUM>, <NUM> mmol), n-BuLi (<NUM>, a <NUM> solution in hexane, <NUM> mmol), HfCl<NUM> (<NUM>, <NUM> mmol), MeMgBr (<NUM>, a <NUM> solution in diethyl ether, <NUM> mmol) and toluene (<NUM>). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM> (quintet, J = <NUM>, <NUM>), <NUM>(septet, J = <NUM>, <NUM>, CH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM> (m, <NUM>), <NUM> (s, <NUM>, HfCH<NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using <NUM>,<NUM>-di(<NUM>-pentyl)aniline (<NUM>, <NUM> mmol), <NUM>-bromo-<NUM>-pyridinecarboxaldehyde (<NUM>, <NUM> mmol) and toluene (<NUM>). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(s, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(quintet, J = <NUM>, <NUM>), <NUM>(quintet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using the compound (<NUM>, <NUM> mmol), <NUM>-naphthylboronic acid (<NUM>, <NUM> mmol), Na<NUM>CO<NUM> (<NUM>, <NUM> mmol), toluene (<NUM>), degassed H<NUM>O/EtOH (<NUM>, v/v, <NUM>:<NUM>), and a solution of (Ph<NUM>P)<NUM>Pd (<NUM>, <NUM> mmol) in toluene (<NUM>). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM> (s, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(quintet, J = <NUM>, <NUM>, CH), <NUM>(quintet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>) ppm.

HRMS (EI): m/z calcd ([M+] C<NUM>H<NUM>N<NUM>) <NUM>. Found: <NUM>.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM> (m, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>, NH), <NUM>(septet, J = <NUM>, <NUM>, CH), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM> (d, J = <NUM>, <NUM>, CH<NUM>), <NUM> (d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using the ligand compound (<NUM>, <NUM> mmol), n-BuLi (<NUM>, a <NUM> solution in hexane, <NUM> mmol), HfCl<NUM> (<NUM>, <NUM> mmol), MeMgBr (<NUM>, a <NUM> solution in diethyl ether, <NUM> mmol) and toluene (<NUM>). A dark yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(m, <NUM>, CH), <NUM>(septet, J = <NUM>, <NUM>, CH), <NUM>(m, <NUM>, CH), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM> (s, <NUM>, HfCH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM>(m, <NUM>, HfCH<NUM>, CH<NUM>), <NUM> (t, J = <NUM>, <NUM>, CH<NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

(C<NUM>H<NUM>HfN<NUM>) : C, <NUM>; H, <NUM>; N, <NUM>%. Found: C, <NUM>; H, <NUM>; N, <NUM>%.

Preparation was performed by the same method as in Example <NUM> using <NUM>,<NUM>-diphenylaniline (<NUM>, <NUM> mmol), <NUM>-bromo-<NUM>-pyridinecarboxaldehyde (<NUM>, <NUM> mmol) and toluene (<NUM>).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM>(s, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM>(s, <NUM>, NCH), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (m, <NUM>), <NUM> (t, J = <NUM>, <NUM>), <NUM> (m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using the compound (<NUM>, <NUM> mmol) and <NUM>-isopropylphenyllithium (<NUM>, <NUM> mmol). A white solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM> (d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (m, <NUM>), <NUM> (m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>, NH), <NUM>(septet, J = <NUM>, <NUM>, CH), <NUM>. <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>) : δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>. <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>), <NUM>(septet, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(m, <NUM>, HfCH<NUM>, CH<NUM>), -<NUM>(s, <NUM>, HfCH<NUM>) ppm.

<NUM>C NMR: δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Under N<NUM>, a Schlenk flask was charged with <NUM>,<NUM>-dibromopyridine (<NUM>, <NUM> mmol), <NUM>-naphthylboronic acid (<NUM>, <NUM> mmol), Na<NUM>CO<NUM> (<NUM>, <NUM> mmol) and toluene (<NUM>). Then, a degassed H<NUM>O-EtOH mixture (<NUM>:<NUM> [v/v], <NUM>) and a solution of (Ph<NUM>P)<NUM>Pd (<NUM>, <NUM> mmol in toluene (<NUM>) were injected thereto. A two-phase solution was heated to <NUM> and vigorously stirred overnight. After cooling to room temperature, an organic phase was collected and washed with H<NUM>O (<NUM>). The product was extracted with toluene (<NUM> x <NUM>). The organic phase thus collected was dried with anhydrous MgSO<NUM>, and a solvent was removed in a rotary evaporator. The product was separated by column chromatography on silica gel using a mixture of hexane and toluene (<NUM>:<NUM>, v/v). A white solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm. (C<NUM>H<NUM>BrN): C, <NUM>; H, <NUM>; N, <NUM>%. Found: C, <NUM>; H, <NUM>; N, <NUM>%.

The compound (<NUM>, <NUM> mmol) was dissolved in THF (<NUM>) and cooled to about -<NUM>. t-BuLi (<NUM>, a <NUM> solution in hexane, <NUM> mmol) was introduced, and a mixture was stirred at about -<NUM> for <NUM> hours. Then, a solution of <NUM>,<NUM>-(cycloheptyl)<NUM>C<NUM>H<NUM>N=C(H)Ph (<NUM>, <NUM> mmol) in THF (<NUM>) was added thereto. After stirring at about -<NUM> for <NUM> hours, the temperature of the solution thus produced was slowly raised to room temperature. After stirring overnight, water (<NUM>) was added, and a product was extracted with ethyl acetate (<NUM> x <NUM>). An organic phase was collected and dried with MgSO<NUM>. A solvent was removed in a rotary evaporator. Through separation by column chromatography on silica gel using hexane and toluene containing a small amount of triethylamine (v/v, <NUM>:<NUM>:<NUM>), a lemon yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM> (m, <NUM>), <NUM>. <NUM> (m, <NUM>), <NUM>. <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (d, J = <NUM>, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>, NH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using the ligand compound (<NUM>, <NUM> mmol), n-BuLi (a <NUM> solution in hexane, <NUM>, <NUM> mmol), HfCl<NUM> (<NUM>, <NUM> mmol), and MeMgBr (<NUM>, a <NUM> solution in diethyl ether, <NUM> mmol). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (s, <NUM>, HfCH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM> (m, <NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using <NUM>-bromo-<NUM>-(naphthalene-<NUM>-yl)pyridine (<NUM>, <NUM> mmol), t-BuLi (<NUM>, a <NUM> solution in hexane, <NUM> mmol), <NUM>,<NUM>-(cyclohexyl)<NUM>C<NUM>H<NUM>N=C(H)Ph (<NUM>, <NUM> mmol), and THF (<NUM>). Through separation by column chromatography on silica gel using hexane and toluene containing a small amount of triethylamine (v/v, <NUM>:<NUM>:<NUM>), a pale yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(m, <NUM>), <NUM>. <NUM> (m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(quintet, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(s, <NUM>, NH), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm. HRMS (EI): m/z calcd [M+] C<NUM>H<NUM>N<NUM>) <NUM>. Found: <NUM>.

Preparation was performed by the same method as in Example <NUM> using HfCl<NUM> (<NUM>, <NUM> mmol), MeMgBr (<NUM>, a <NUM> solution in diethyl ether, <NUM> mmol) and the ligand compound (<NUM>, <NUM> mmol). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

Preparation was performed by the same method as in Example <NUM> using <NUM>-bromo-<NUM>-(naphthalene-<NUM>-yl)pyridine (<NUM>, <NUM> mmol), t-BuLi (<NUM>, a <NUM> solution in hexane, <NUM> mmol), <NUM>,<NUM>-(cyclopentyl)<NUM>C<NUM>H<NUM>N=C(H)Ph (<NUM>, <NUM> mmol), and THF (<NUM>). Through separation by column chromatography on silica gel using hexane and toluene containing a small amount of triethylamine (v/v, <NUM>:<NUM>:<NUM>), a pale yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(m, <NUM>), <NUM>. <NUM> (m, <NUM>), <NUM>. <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>, NH), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(m, <NUM>), <NUM>(quintet, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(m, <NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

The above compound was prepared according to a known method.

Preparation was performed by the same method as in Example <NUM> using <NUM>,<NUM>-diethylaniline (<NUM>, <NUM> mmol), <NUM>-bromo-<NUM>-pyridinecarboxaldehyde (<NUM>, <NUM> mmol) and toluene (<NUM>). A lemon yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM> (s, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>), <NUM>(s, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(quartet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C NMR(C<NUM>D6): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

HRMS (EI) : m/z calcd([M+] C<NUM>H<NUM>BrN<NUM>) <NUM>. Found: <NUM>.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM> (s, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(quartet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(s, <NUM>, NH), <NUM>(septet, J = <NUM>, <NUM>, CH), <NUM>(m, <NUM>, CH<NUM>), <NUM>(m, <NUM>, CH<NUM>) ppm.

<NUM>C NMR (C<NUM>D<NUM>) : δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

A Schlenk flask was charged with the HfCl<NUM> (<NUM>, <NUM> mmol) and toluene (<NUM>). Under N<NUM>, the temperature was reduced to about -<NUM>, and MeMgBr (<NUM>, a <NUM> solution in diethyl ether, <NUM> mmol) was added thereto dropwisely. The mixture was stirred at -<NUM> to -<NUM> for <NUM> hour to precipitate a white solid. The temperature was reduced to about -<NUM> again, and a solution of the ligand compound (<NUM>, <NUM> mmol) in toluene (<NUM>) was added thereto dropwisely. After stirring the mixture thus produced at -<NUM> to -<NUM> for <NUM> hour, the temperature was slowly raised to room temperature. After stirring overnight, all volatile materials were removed through a vacuum line. A product was extracted with toluene (<NUM>). The extract was filtered on a celite and collected. After removing a solvent through a vacuum line, the residue was softened in hexane (<NUM>). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM> (t, J = <NUM>, <NUM>), <NUM>(s, <NUM>, NCH), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>, CH<NUM>), <NUM>(m, <NUM>, CH), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM> (d, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(d, J= <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

(C<NUM>H<NUM>HfN<NUM>): C, <NUM>; H, <NUM>; N, <NUM>%. Found: C, <NUM>; H, <NUM>; N, <NUM>%.

Preparation was performed by the same method as in Example <NUM> using <NUM>-bromo-<NUM>-(naphthalene-<NUM>-yl)pyridine (<NUM>, <NUM> mmol), t-BuLi (<NUM>, a <NUM> solution in hexane, <NUM> mmol), <NUM>,<NUM>-Et<NUM>C<NUM>H<NUM>N=C(H)Ph (<NUM>, <NUM> mmol), and THF (<NUM>). By separating using column chromatography on silica gel using hexane and toluene containing a small amount of triethylamine (v/v, <NUM>:<NUM>:<NUM>), a pale yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>, NH), <NUM>(m, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>. <NUM>, <NUM>, <NUM>. <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm. HRMS (EI) : m/z calcd([M+] C<NUM>H<NUM>N<NUM>) <NUM>. Found: <NUM>.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>. <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (s, <NUM>, NCH), <NUM>(sextet, J = <NUM>, <NUM>, CH<NUM>), <NUM> (sextet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(sextet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(sextet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm.

<NUM>H NMR (C<NUM>D<NUM>) : δ <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>. <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM> (m, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>, NCH), <NUM> (d, J = <NUM>, <NUM>, NH), <NUM>(m, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>) ppm.

<NUM>C NMR(C<NUM>D<NUM>): δ <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> ppm. HRMS (EI) : m/z calcd([M+] C<NUM>H<NUM>N<NUM>) <NUM>. Found: <NUM>.

Preparation was performed by the same method as in Example <NUM> using HfCl<NUM> (<NUM>, <NUM> mmol), MeMgBr (<NUM>, a <NUM> solution in diethyl ether, <NUM> mmol) and <NUM> (<NUM>, <NUM> mmol). A yellow solid was obtained (<NUM>, <NUM>%).

<NUM>H NMR(C<NUM>D<NUM>): δ <NUM>(d, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM>(t, J = <NUM>, <NUM>), <NUM> (d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM>(m, <NUM>), <NUM>(m, <NUM>), <NUM>(d, J = <NUM>, <NUM>), <NUM> (s, <NUM>, NCH), <NUM>(sextet, J = <NUM>, <NUM>, CH<NUM>), <NUM> (sextet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(sextet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(sextet, J = <NUM>, <NUM>, CH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>), <NUM>(t, J = <NUM>, <NUM>, CH<NUM>), <NUM>(s, <NUM>, HfCH<NUM>) ppm.

A bomb reactor (<NUM>) was emptied at <NUM> for <NUM> hour. After charging the bomb reactor with an ethylene gas under an atmospheric pressure, a solution of Me<NUM>Al (<NUM>, <NUM>µmol-Al) in methylcyclohexane (<NUM>) was added to the reactor. The mixture thus obtained was stirred at <NUM> for <NUM> hour using a mantle, and then, a solution was removed using a cannular. The reactor was emptied again to remove remaining solvents, and recharged with an ethylene gas under an atmospheric pressure. This procedure was performed for purging catalyst poison.

The reactor was charged with methylcyclohexane (<NUM>) containing MMAO (AkzoNobel, <NUM> wt%-Al in heptane, <NUM>, <NUM>µmol-Al), and the temperature was set to <NUM>. A solution of (<NUM>-hexyl)<NUM>Zn (<NUM>µmol) in methylcyclohexane (<NUM>) was supplied. Then, a methylcyclohexane solution (<NUM>) containing each transition metal compound (<NUM>µmol-Hf) of the Examples or Comparative Examples activated with [(C<NUM>H<NUM>)<NUM>N(H)Me]+[B(C<NUM>F<NUM>)<NUM>]- (<NUM> eq) in benzene was injected.

The reactor was charged with an ethylene/propylene mixture gas (<NUM> bar/<NUM> bar, total <NUM> bar) at <NUM> bar in a tank, and polymerization was performed at <NUM>-<NUM> for <NUM> minutes. The remaining ethylene/propylene mixture gas was exhausted, and through drying in a vacuum oven of <NUM> overnight, an ethylene/propylene copolymer was obtained.

The weights of the ethylene/alpha-olefin copolymers prepared through the Experimental Example were measured, and yields were calculated.

Measurement was conducted by <NUM>H NMR spectrum.

Measurement was conducted by GPC using trichlorobenzene at <NUM> and standardizing by polystyrene. By using Mw and Mn thus measured, MWD was calculated by dividing a Mw value by a Mn value.

From the polymerization results, the transition metal compounds of the Examples generally showed higher catalyst activity when compared with the transition metal compounds of the Comparative Examples, and could prepare ethylene/alphaolefin copolymers with excellent yields.

For example, the transition metal compounds of Examples <NUM> and <NUM> could be used for polymerization for longer time when compared with Comparative Example <NUM>. Particularly, it could be found that the monomer was hardly consumed after the lapse of <NUM> minutes in Comparative Example <NUM>, and on the contrary, the monomer was steadily consumed until about <NUM> minutes in Examples <NUM> and <NUM>.

Claim 1:
A transition metal compound represented by the following Formula 1a:
<CHM>
in Formula 1a,
M is Ti, Zr or Hf,
R<NUM> and R<NUM> are each independently hydrogen; a substituted or unsubstituted alkyl group of <NUM> to <NUM> carbon atoms; a substituted or unsubstituted cycloalkyl group of <NUM> to <NUM> carbon atoms; or a substituted or unsubstituted aryl group of <NUM> to <NUM> carbon atoms, where the substitution is conducted with an alkyl group of <NUM> to <NUM> carbon atoms,
each R<NUM> is independently a cycloalkyl group of <NUM> to <NUM> carbon atoms; or an aryl group of <NUM> to <NUM> carbon atoms, and
Y<NUM> and Y<NUM> are each independently a halogen group; an alkyl group of <NUM> to <NUM> carbon atoms; an alkenyl group of <NUM> to <NUM> carbon atoms; an alkynyl group or <NUM> to <NUM> carbon atoms; a cycloalkyl group of <NUM> to <NUM> carbon atoms; an aryl group of <NUM> to <NUM> carbon atoms; an alkylaryl group of <NUM> to <NUM> carbon atoms; an arylalkyl group of <NUM> to <NUM> carbon atoms; a heteroaryl group of <NUM> to <NUM> carbon atoms; an alkoxy group of <NUM> to <NUM> carbon atoms; an aryloxy group of <NUM> to <NUM> carbon atoms; an alkylamino group of <NUM> to <NUM> carbon atoms; an arylamino group of <NUM> to <NUM> carbon atoms; an alkylthio group of <NUM> to <NUM> carbon atoms; an arylthio group of <NUM> to <NUM> carbon atoms; an alkylsilyl group of <NUM> to <NUM> carbon atoms; an arylsilyl group of <NUM> to <NUM> carbon atoms; a hydroxyl group; an amino group; a thio group; a silyl group; a cyano group; or a nitro group.