bis(tricyclohexylphosphine)benzylidene ruthenium(IV) dichloride in dichloromethane T=20°C; Cyclization; 0.5 h;

1: With bis(tricyclohexylphosphine)benzylidene ruthenium(IV) dichloride in toluene T=25°C; 2: With bis(tricyclohexylphosphine)benzylidene ruthenium(IV) dichloride; ethyl vinyl ether in toluene T=25 - 110°C;

1: 90 percent / Grubbs' catalyst / CH2Cl2 / 0.5 h / 20 °C 2: 29 percent / MCPBA / CH2Cl2 / 20 °C View Scheme