| 摘要 |
Abstract 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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