Patent ID: 8513151

Claim:
A process for preparing a sulfur chelated ruthenium compound represented by the following formula: wherein M indicates the ruthenium metal bound to a benzylidene carbon; R represents C 1 -C 7 alkyl group or optionally substituted aryl; X 1 and X 2 each independently represent halogen; Y 1 and Y 2 each independently denote unsubstituted or alkyl-substituted phenyl; and Z independently represents hydrogen, electron withdrawing or electron donating substituent, with m being an integer from 1 to 4; wherein the process is illustrated by the following route of synthesis: said process comprises reacting a benzaldehyde derivative of formula (1), wherein L is a leaving group, with thiol RSH to give 2-thiobenzaldehyde derivative of formula (2), transforming said derivative of formula (2) into the corresponding alkene of formula (3) through a Wittig reaction, and reacting said compound of formula (3) with a ruthenium compound of formula (4) to form the sulfur chelated ruthenium product of formula (I), wherein Z, m, R, X 1 , X 2 , Y 1 , Y 2 have the meanings defined above, L is a leaving group and PCy3 is a phosphine which contains three cyclic aliphatic moieties.