4-(N,N-dimethlyamino)pyridine; oxalyl dichloride; triethylamine; N,N-dimethyl-formamide 1.) CH2Cl2, room temp., 1 h, 2.) CH2Cl2, -78 deg C to room temp., 4 h; Yield givenMultistep reaction;

benzylidene[1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene] dichloro (tricyclohexylphosphine)ruthenium in dichloromethane ring-closing metathesis; 4 h; Heating;