Patent ID: 6552139
Filing Date: 2003-04-22
Classification: C07C,C07F

Abstract:
A process for preparing acyclic olefins having two or more carbon atoms or cyclic olefins having three or more carbon atoms, in each case corresponding to the formula VI: from acyclic olefins having two or more carbon atoms or from cyclic olefins having three or more carbon atoms, in each case corresponding to the formula VI, whereinRâ€²1, Râ€²2, Râ€²3 and Râ€²4 in the formula VI are identical or different and are each a hydrogen atom or a hydrocarbon group, where the hydrocarbon groups are identical or different and are independently straight-chain, branched or cyclic radicals selected from the group consisting of alkyl radicals having from 1 to 50 carbon atoms, alkenyl radicals having from 2 to 50 carbon atoms, alkynyl radicals having from 2 to 50 carbon atoms, aryl radicals having from 6 to 30 carbon atoms, metallocenyl and silyl radicals in which, at least one hydrogen is optionally replaced by a functional group, and one or more of Râ€²1, Râ€²2, Râ€²3 and Râ€²4 are optionally identical or different halo, nitro, nitroso, hydroxy, alkoxy, aryloxy, amino, amido, carboxyl, carbonyl, thio, sulfonyl or metallocenyl groups, or one or more pairs of Râ€²1, Râ€²2, Râ€²3 and Râ€²4 form one or more rings; the process comprising contacting an olefin with at least one catalyst such that an olefin metathesis reaction occurs, wherein the catalyst comprises the complex of ruthenium of formula I where X is an anionic ligand, Z is a monodentate, bidentate or tridentate ligand which contains a metal and is nonionically bound to the ruthenium center, R1 and R2 are identical or different and are hydrogen or a hydrocarbon group, where the hydrocarbon groups are identical or different and are each a straight-chain, branched or cyclic radical selected from the group consisting of alkyl radicals having from 1 to 50 carbon atoms, alkenyl radicals having from 2 to 50 carbon atoms, alkynyl radicals having from 2 to 50 carbon atoms, aryl radicals having from 6 to 30 carbon atoms and silyl radicals, where one or more of the hydrogen atoms in the hydrocarbon or silyl groups may be replaced by identical or independently different alkyl, aryl, alkenyl, alkynyl, metallocenyl, halogen, nitro, nitroso, hydroxy, alkoxy, aryloxy, amino, amido, carboxyl, carbonyl, thio or sulfonyl groups, or R1 and R2 are identical or different and form a ring, L is an N-heterocyclic carbene ligand having one of the formulas II-V: where R1, R2, R3 and R4 in the formulas II, III, IV and V are identical or different and are each hydrogen or a hydrocarbon group, where the hydrocarbon groups are identical or different and are each independently cyclic, straight-chain or branched radicals selected from the group consisting of alkyl radicals having from 1 to 50 carbon atoms, alkenyl radicals having from 2 to 50 carbon atoms, alkynyl radicals having from 2 to 50 carbon atoms, and aryl radicals having from 6 to 30 atoms, in which at least one hydrogen may be replaced by a functional group and where R3 and R4 are identical or different and are each independently a halogen, nitro, nitroso, alkoxy, aryloxy, amido, carboxyl, carbonyl, thio or sulfonyl group.