1: 79 percent / Cl2Ru(CHPh)(PCy3)2 / CH2Cl2 / 12 h / Heating 2: 98 percent / NaOH / tetrahydrofuran / 2 h / 20 °C 3: 67 percent / Et3N; DMAP / CH2Cl2 / 1.5 h / 20 °C 4: 89 percent / NaH / tetrahydrofuran / 0 - 20 °C 5: 50 percent / DDQ / dioxane / 4 h / 110 °C 6: 78 percent / HCl / tetrahydrofuran / 3 h / Heating View Scheme