摘要：

of the Disclosure Akylidene complexes of ruthenium containing N-heterocyclic carbene ligands and their use as highly active, selective catalysts for olefin metathesisThe invention relates to a complex of ruthenium of the structural formula I, where X 1 and X 2 are identical or different and are each an anionic ligand, R 1 and R 2 are identical or different and can also contain a ring, and R 1 and R 2 are each hydrogen or/and a hydrocarbon group, the ligand L 1 is an N-heterocyclic carbene and the ligand L 2 is an uncharged electron donor, in particular an N-heterocyclic carbene or an amine, imine, phosphine, phosphite, stibine, arsine, carbonyl compound, carboxyl compound, nitrile, alcohol, ether, thiol or thioether,where R 1 , R 2 , R 3 and R 4 are hydrogen or/and hydrocarbon groups.The invention further relates to a process for preparing acyclic olefins having two or more carbon atoms or/and cyclic olefins having four or more carbon atoms from acyclic olefins having two or more carbon atoms or/and from cyclic olefins having four or more carbon atoms by an olefin metathesis reaction in the presence of at least one catalyst, wherein a complex is used as catalyst and R' 1 , R' 2 , R' 3 and R' 4 are hydrogen or/and hydrocarbon groups.

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