Patent ID: 7452949

Claim:
An organometallic transition metal compound of the formula (I): where M 1 is an element of group 3, 4, 5 or 6 of the Periodic Table of the Elements or the lanthanides; the radicals X are identical or different and are each an organic or inorganic radical, with two radicals X also being able to be joined to one another; m is 1 or 2; n is a natural number from 1 to 4; R 1 is hydrogen or an organic radical having from 1 to 40 carbon atoms; R 3 is a substituted or unsubstituted C 6 -C 40 aryl radical; R 4 is hydrogen, halogen or an organic radical having from 1 to 40 carbon atoms; R 5 is an organic radical which has from 3 to 20 carbon atoms and is branched in the α position; R 7 , R 8 are identical or different and are each hydrogen or an organic radical having from 1 to 40 carbon atoms or R 7 and R 8 together with the atoms connecting them form a monocyclic or polycyclic, substituted or unsubstituted ring system which has from 1 to 40 carbon atoms and optionally contains heteroatoms selected from the group consisting of the elements Si, Ge, N, P, O, S, Se and Te; and A is a bridge consisting of a divalent atom or a divalent group.