1: 55 percent / diethylaluminum chloride / CH2Cl2; hexane / 16 h / 20 °C 2: 83 percent / LiOEt / tetrahydrofuran; hexane; ethanol / 28 h / 40 - 45 °C 3: 68 percent / (CyP)2-Cl2Ru=CHPh / CH2Cl2 / 24 h / 35 - 40 °C 4: m-chloroperoxybenzoic acid / CH2Cl2 / 0.25 h / -78 °C 5: 38 mg / CCl4 / 18 h / 50 °C View Scheme