ALKYLIDENE COMPLEXES OF RUTHENIUM CONTAINING N-HETEROCYCLIC CARBENE LIGANDS; USE AS HIGHLY ACTIVE, SELECTIVE CATALYSTS FOR OLEFIN METATHESIS

摘要

The invention relates to a complex of ruthenium of the structural formula I, where X¹ and X² are identical or different and are each an anionic ligand, R¹ and R² are identical or different and can also contain a ring, and R¹ and R² are each hydrogen or/and a hydrocarbon group, the ligand L¹ is an N-heterocyclic carbene and the ligand L² is an uncharged electron donor, in particular an N-heterocyclic carbene or an amine, imine, phosphine, phosphate, stibine, arsine, carbonyl compound, carboxyl compound, nitrile, alcohol, ether, thiol or thioether, where R¹, R², R³ and R⁴ 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.