Patent ID: 8013095

Claim:
A composition comprising a Ru(0)-sulfoxide complex catalyst (D) of the formula (I), wherein a) at least one of the ligands L 1 -L 5 is a sulfoxide ligand of the formula (II) R 1 —S(═O)—R 2 (II), where the radicals R 1 and R 2 are identical or different and are selected independently from the group consisting of straight-chain and branched alkyl groups, alkenyl groups and alkynyl groups; straight-chain and branched alkyl groups, alkenyl groups and alkynyl groups having at least one substituent selected from the group consisting of alkoxy, siloxy, aryloxy, aryl, silyl, alkoxycarbonyl, aryloxycarbonyl, acyloxy, carboxamido, carbamoyl groups and halogen atoms; and phenyl groups which are substituted or unsubstituted, where substituents are selected from the group consisting of alkyl, alkenyl, alkynyl, silyl, alkoxy, siloxy, aryloxy, aryl, alkoxycarbonyl, aryloxycarbonyl, acyloxy, carboxamido and carbamoyl groups and halogen atoms; and wherein R 1 and R 2 are optionally joined to form a heterocycle containing the sulfur atom or a heterocycle containing further heteroatoms, with the proviso that R 1 and R 2 together have 2-24 carbon atoms; b) at least one of the ligands L 1 -L 5 is a ligand which is π-bonded via one or two C═C functions and has the formula (III) where the radicals R 3 -R 6 are selected independently from the group consisting of hydrogen, straight-chain or branched, cyclic or acyclic, C 1 -C 50 -alkyl, C 2 -C 50 -alkenyl, C 2 -C 50 -alkynyl, and C 6 -C 30 -aryl radicals in which individual carbon atoms are unsubstituted or substituted by halogen, O, N, S, Si or P atoms, and c) remaining ligands L 1 -L 5 are identical or different and are selected from the group consisting of uncharged 2-, 4- or 6-electron donor ligands containing CO; CNR′″, where R′″ is selected from the group consisting of alkyl and aryl; PR′″ 3 and P(OR′″) 3 , where R′″ is selected from the group consisting of alkyl and aryl; ligands containing N donors; ligands which contain S donors and do not correspond to the sulfoxides of formula (I); ligands containing O donors; and carbene ligands; with the proviso that none of the ligands L 1 -L 5 is 1,5-cyclooctadiene or 1,3,5-cyclooctatriene.