Patent ID: 8507398

Claim:
A ruthenium- or osmium carbene complex catalyst having the general formulae (IIa), where M is ruthenium or osmium, X 1 and X 2 are identical or different and are two ligands, L 1 and L 2 are identical or different ligands, where L 2 can alternatively also be bridged by the radical R 8 , n is 0, R 1 -R 8 are identical or different and are each hydrogen, halogen, hydroxyl, aldehyde, keto, thiol, CF 3 , nitro, nitroso, cyano, thiocyano, isocyanato, carbodiimide, carbamate, thiocarbamate, dithiocarbamate, amino, amido, imino, silyl, sulphonate (—SO 3 − ), —OSO 3 − , —PO 3 − or OPO 3 − or alkyl, cycloalkyl, alkenyl, alkynyl, aryl, carboxylate, alkoxy, alkenyloxy, alkynyloxy, aryloxy, alkoxycarbonyl, alkylamino, alkylthio, arylthio, alkylsulphonyl, alkylsulphinyl, dialkylamino, alkylsilyl or alkoxysilyl, where these radicals may each optionally be substituted by one or more alkyl, halogen, alkoxy, aryl or heteroaryl radicals or alternatively two directly adjacent radicals from the group R 1 -R 8 together with the ring carbons to which they are bound form, by bridging, a cyclic group, preferably an aromatic system, or alternatively R 8 can be bridged to another ligand of the ruthenium- or osmium-carbene complex catalyst m is 0 or 1, and A is oxygen, sulphur, C(R 9 R 10 ), N—R 11 , —C(R 12 )═C(R 13 )—, —C(R 12 )(R 14 )—C(R 13 )(R 15 )—, where R 9 -R 15 are identical or different and each have one of the meanings of the radicals R 1 -R 8 .