1: 75 percent / sodium hydride / tetrahydrofuran / 4 h / 20 °C 2: RuCl2(PCy3)(benzylidene)(1,3-dimesitylimidazol-2-ylidene) / CH2Cl2 / 6 h / Heating View Scheme

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

bis(tricyclohexylphosphine)benzylidene ruthenium(IV) dichloride in dichloromethane ring closing metathesis; 24 h; Heating;