Abstract A new flexible and stereoselective protocol for the synthesis of the compounds of the general formula,(Z)-Ph 2 RSiCH= CHSiRPh 2 (where R is an alkyl, alkenyl or alkoxy substituent) has been developed. The title compounds have been efficiently obtained by ruthenium hydride complex [RuHCl (CO)(PCy 3) 2]-catalyzed (Z)-selective silylative coupling cyclization of 1, 2-bis (diphenylvinylsiloxy) ethane or N, N′-dimethyl-N, N′-di ( ...