1: 90 percent / Na2CO3, hexamethylphosphoramide (HMPA) / 5 h / 80 - 90 °C 2: 90 percent / Mg, (I2) / diethyl ether / 3 h / Heating 3: 95 percent / H2SO4 (80percent) / 0.5 h / Heating 4: 93 percent / m-chloroperbenzoic acid (85percent) / CH2Cl2 5: 1) H2SO4, 2) perchloric acid / 1) 10 days 6: 44 percent / Mg, (I2) / diethyl ether; tetrahydrofuran / 5 h / Heating View Scheme