Transition metal complexes with diaminocarbene ligands and their use in reactions catalyzed by transition metals

Compound of the general structural formula (I),

• where
• M is transition metal of transition groups 6 to 8 of the Periodic Table,
• R1, R2, R3 and R4 are identical or different and are hydrogen and/or hydrocarbon groups, where the hydrocarbon groups are identical or different, straight-chain, branched or cyclic radicals selected from the group consisting of alkyl radicals having from 1 to 50 carbon atoms, alkenyl radicals having from 2 to 50 carbon atoms, alkynyl radicals having from 2 to 50 carbon atoms and aryl radicals having from 6 to 30 carbon atoms in which at least one hydrogen atom is replaceable by a functional group, and/or
• R1 and R2 and/or R3 and R4 are part of a cyclic system which is identical or different, where the cyclic system comprises a carbon framework having from 2 to 20 carbon atoms and a nitrogen atom in formula (I), where the carbon atoms of R1 and R2 and/or R3 and R4 in formula (I) are not counted and where at least one hydrogen atom in the ring is replaceable by a functional group and/or at least one carbon atom of the ring is replaceable by a heteroatom selected from the group consisting of S, P, O and N, and/or
• R1 and/or R2 and/or R3 and/or R4 are linked to one of the ligands L via a bridge having from 1 to 20 carbon atoms, where the carbon atoms of R1, R2 R3 and R4 are not counted, and
• L is an identical or independently different uncharged two-electron donors and/or is a part of a cyclic system and/or is anionic ligands, and
• n is an integer.