Patent ID: 7589223

Claim:
A transition metal compound of the formula (I) where M is an element of group 3, 4, 5, 6, 7, 8, 9 or 10 of the Periodic Table of the Elements or the lanthanides, X are identical or different and are each an organic or inorganic anionic monovalent ligand, where two radicals x may also be joined to form a divalent radical, n is 1, 2, 3 or 4, L 1 is an organic or inorganic uncharged ligand, h is an integer from 0 to 4, R 1 and R 1′ can be identical or different and are each hydrogen or an organic radical having from 1 to 40 carbon atoms, R 2 and R 2′ can be identical or different and are each a substituted or unsubstituted C 6 -C 40 -aryl radical or C 2 -C 40 -heteroaromatic radical containing at least one heteroatom selected from the group consisting of O, N, S and P, and Y is a divalent group between the two sp 2 -hybridized carbon atoms and is selected from the group consisting of the two-membered bridges —N(R 3 )—N(R 4 )— and —O—N(R 5 )— and the one-membered bridges —O—, —N(R 6 )—, —N(OR 7 )— and —N(NR 8 R 9 )—, where R 3 , R 4 , R 5 , R 6 , R 7 , R 8 and R 9 are identical or different and are each hydrogen or an organic radical having from 1 to 40 carbon atoms, where two adjacent radicals may also form a divalent organic group having from 1 to 40 carbon atoms which together with the atom or atoms connecting its ends forms a heterocyclic ring system.