1: 79 percent / hydrochloric acid / acetone; H2O / 1 h / Heating 2: CH2Cl2 / 7 h / 25 °C 3: dry hydrogen chloride / CH2Cl2 / 10 h 4: 60 percent / ceric ammonium nitrate / acetonitrile; H2O / 0.17 h / 0 °C 5: 92 percent / p-tuluenesulfonic acid / methanol / 4 h / Heating 6: 98 percent / 0.5 M K2CO3 / H2O / 4 h / 85 °C View Scheme

1: 79 percent / hydrochloric acid / acetone; H2O / 1 h / Heating 2: CH2Cl2 / 7 h / 25 °C 3: dry hydrogen chloride / CH2Cl2 / 10 h 4: 60 percent / ceric ammonium nitrate / acetonitrile; H2O / 0.17 h / 0 °C 5: 92 percent / p-tuluenesulfonic acid / methanol / 4 h / Heating 6: 98 percent / 0.5 M K2CO3 / H2O / 4 h / 85 °C 7: NH4OH / H2O / 30 h / 23 °C View Scheme

1: 79 percent / hydrochloric acid / acetone; H2O / 1 h / Heating 2: CH2Cl2 / 7 h / 25 °C 3: dry hydrogen chloride / CH2Cl2 / 10 h 4: 60 percent / ceric ammonium nitrate / acetonitrile; H2O / 0.17 h / 0 °C View Scheme