1.1: Ph3P / tetrahydrofuran 1.2: 66 percent / H2O 2.1: 89 percent / Et3N; DMAP / CH2Cl2 / 4.5 h / 0 - 20 °C 3.1: 79 percent / Cl2Ru(CHPh)(PCy3)2 / CH2Cl2 / 12 h / Heating 4.1: 98 percent / NaOH / tetrahydrofuran / 2 h / 20 °C 5.1: 67 percent / Et3N; DMAP / CH2Cl2 / 1.5 h / 20 °C 6.1: 89 percent / NaH / tetrahydrofuran / 0 - 20 °C 7.1: 50 percent / DDQ / dioxane / 4 h / 110 °C 8.1: 78 percent / HCl / tetrahydrofuran / 3 h / Heating View Scheme