1: 70 percent / HCl, CaCl2 / various solvent(s) / 0.17 h 2: 1.)NaH / 1.) dimethoxyethane, hexane, 0 deg C, 5 min, 2.) 35 min 3: 70 percent / Et3N / CH2Cl2 / 12 h / 20 °C 4: 27 percent / m-chloroperbenzoic acid / CH2Cl2 / 0.67 h / 0 °C View Scheme