1: 87 percent / p-toluenesulfonic acid monohydrate / acetone / 3 h / 0 - 5 °C 2: 86 percent / diethyl ether; tetrahydrofuran / 3 h / Ambient temperature 3: 70 percent / cerium(IV) ammonium nitrate / CHCl3; acetonitrile; H2O / 0.17 h / Ambient temperature 4: 27 percent / AgO, 40percent HNO3 / acetone / 0.17 h / Ambient temperature View Scheme

1: 52 percent / (NH4)2Ce(NO3)6 / H2O; acetonitrile / 0.5 h / Ambient temperature 2: 27 percent / AgO, 40percent HNO3 / acetone / 0.5 h / Ambient temperature View Scheme

1: 78 percent / NaOH / methanol / 3 h / Heating 2: 58 percent / Br2 / CCl4 / 1 h / 73 - 74 °C 3: 84 percent / CuI / dimethylformamide; methanol / 30 h / Heating 4: 99 percent / POCl3 / CHCl3 / 10 h / Heating 6: 85 percent / ammonium cerium(IV) nitrate 7: 27 percent / AgO, nitric acid View Scheme

toluene-4-sulfonic acid in acetone Ambient temperature;