Patent ID: 6034258
Filing Date: 2000-03-07
Classification: C07F,C08F

Abstract:
A transition metal complex of the general formula IL.sub.m MX.sub.n I,where the variables have the following meanings:M is titanium, zirconium, hafnium, vanadium, niobium, tantalum or a rare earth metal,X is fluorine, chlorine, bromine, iodine, hydrogen, C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl or OR.sup.1,R.sup.1 is C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl, alkylaryl, arylalkyl, fluoroalkyl or fluoroaryl each having from 1 to 10 carbon atoms in the alkyl radical and from 6 to 20 carbon atoms in the aryl radical,m is 1 or 2,n is 4-m when M is titanium, zirconium or hafnium, oris 5-m when M is vanadium, niobium or tantalum, oris 3-m when M is a rare earth metal, andL is a ligand of the general formula II ##STR13## where A is a bridge which together with the nitrogen and carbon atoms to which it is connected forms a five-membered or six-membered, unsubstituted or substituted aromatic ring which can also contain two further heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen and can be fused to a further isoaromatic or heteroaromatic system having two, three or four rings,R.sup.2 is hydrogen, C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl, tri-(C.sub.1 -C.sub.10)alkylsilyl or tri-(C.sub.6 -C.sub.15)arylsilyl,R.sup.3 is a C.sub.6 -C.sub.15 -aryl-, C.sub.6 -C.sub.15 -fluoroaryl-,C.sub.1 -C.sub.10 -alkyl or C.sub.1 -C.sub.10 -fluoroalkyl radical which bears no hydrogen on the .alpha.-carbon atom andR.sup.4 is hydrogen, C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl, tri-(C.sub.1 -C.sub.10)alkylsilyl or tri-(C.sub.6 -C.sub.15)arylsilyl.