Patent ID: 6916893

Claim:
A transition metal compound of the formula wherein: R 1 , R 3 are hydrogen, C 1 -C 20 -alkyl, C 3 -C 10 -cycloalkyl, C 6 -C 16 -aryl, alkylaryl having from 1 to 10 carbon atoms in the alkyl part and from 6 to 16 carbon atoms in the aryl part, Si(R 6 ) 3 , N(R 6 )(R 7 ), OR 6 SR 6 or R 1 and R 3 together with C a , C b and, if present, C′ form a five-, six- or seven-membered aliphatic or aromatic, substituted or unsubstituted carbocyclic or heterocyclic ring, R 2 , R 4 are C 4 -C 16 -heteroaryl or C 6 -C 16 -aryl bearing C 4 -C 16 -heteroaryl or C 6 -C 16 -aryl substituents in the two vicinal positions relative to the linkage point to N a or N b , R 5 is hydrogen, C 1 -C 10 -alkyl, C 6 -C 16 -aryl or alkylaryl having from 1 to 10 carbon atoms in the alkyl part and from 6 to 16 carbon atoms in the aryl part, R 6 , R 7 are C 1 -C 10 -alkyl, C 6 -C 16 -aryl or alkylaryl having from 1 to 10 carbon atoms in the alkyl part and from 6 to 16 carbon atoms in the aryl part, m is 0 or 1, M is a metal of group VIIIB of the Periodic Table of the Elements, T, Q are uncharged or monoanionic monodentate ligands or T and Q together form a diketoenolate unit or a C 2 — or C 3 -alkylene unit having a methyl ketone end group or a linear C 1 -C 4 -alkylester or nitrile end group, A is a noncoordinating or weakly coordinating anion, x, p are 0, 1, 2 or 3 and q, n are 1, 2 or 3.