1: 95 percent / H2SO4 (80percent) / 0.5 h / Heating 2: 93 percent / m-chloroperbenzoic acid (85percent) / CH2Cl2 3: 1) H2SO4, 2) perchloric acid / 1) 10 days 4: 44 percent / Mg, (I2) / diethyl ether; tetrahydrofuran / 5 h / Heating View Scheme

sulfuric acid 0.5 h; Heating;