Patent ID: 8501975

Claim:
A process for preparing ruthenium complexes of the general formula (I) RuX 2 (═CH—CH 2 R)L 2 (I), wherein X is an anionic ligand, R is hydrogen or a (C 1 -C 18 )-alkyl, (C 3 -C 8 )-cycloalkyl, (C 2 -C 7 )-heterocycloalkyl, (C 6 -C 14 )-aryl or (C 3 -C 14 )-heteroaryl radical and L is selected from the group consisting of phosphanes, phosphinites, phosphonites and phosphites, which comprises A) reacting an Ru metal salt of the general formula (II): RuX x N y (II), wherein x is an integer greater than or equal to 2 and X is as defined above, y is an integer greater than or equal to 0 and y>=1; the ligands N are identical or different coordinating uncharged ligands; with L in the presence of a base and a reducing agent and B) subsequently reacting with a silylalkyne of the general formula III R—C≡CSiR′ 3 (III), wherein R is as defined above, the radicals R′ are identical or different radicals which can be selected from the group consisting of hydrogen, (C 1 -C 8 )-alkyl, (C 1 -C 8 )-alkoxy, (C 6 -C 10 )-aryloxy, (C 6 -C 10 )-aryl.