Patent ID: 7273940

Claim:
A compound of the formula (VI), where the symbols have the following meanings; A is a nonmetal selected from among N, S, O and P, R 1 is a radical of the formula NR 5 R 6 , R 2 is a radical of the formula NR 5 R 6 or NR 7 R 8 , alkyl, aryl or cycloalkyl, R 5 and R 6 together with the N atom form a 5-, 6- or 7-membered ring in which one or more of the —CH— or —CH 2 — groups may be replaced by suitable heteroatom groups and which may be saturated or unsaturated and unsubstituted or substituted or be fused with further carbacyclic or heterocarbacyclic 5- or 6-membered rings which may in turn be saturated or unsaturated and substituted or unsubstituted, and R 7 and R 8 are, independently of one another, alkyl, aryl or cycloalkyl radicals, and R 3 , R 4 are, independently of one another, H or alkyl, aryl or cycloalkyl radicals, n is 1 or 2, M is a transition metal of groups 7, 8, 9 or 10 of the Periodic Table of the Elements, and X is a halide or a C 1 -C 6 -alkyl radical and m is the valence of the metal.