1: 0.58 h / 264 - 282 °C 2: NaOH / methanol / 12 h / Heating 3: LiH / dimethylformamide / -60 °C 4: SbF3 / 2 h / 150 - 160 °C View Scheme

1: 0.58 h / 264 - 282 °C 2: NaOH / methanol / 12 h / Heating 3: LiH / dimethylformamide / -60 °C 4: SbF3 / 2 h / 150 - 160 °C 5: 98 percent / H2O2; H2O / acetic acid / 3 h / 80 - 88 °C 6: 84 percent / H2SO4*SO3 / CH2Cl2 / 20 h / 0 - 42 °C View Scheme

1: 0.58 h / 264 - 282 °C 2: NaOH / methanol / 12 h / Heating 3: LiH / dimethylformamide / -60 °C 4: SbF3 / 2 h / 150 - 160 °C 5: 98 percent / H2O2; H2O / acetic acid / 3 h / 80 - 88 °C 6: 79 percent / H2SO4*SO3 / CH2Cl2 / 1.5 h / 20 °C 7: 92 percent / acetonitrile / 1.5 h / 60 °C View Scheme

1: 0.58 h / 264 - 282 °C 2: NaOH / methanol / 12 h / Heating 3: LiH / dimethylformamide / -60 °C 4: SbF3 / 2 h / 150 - 160 °C 5: 98 percent / H2O2; H2O / acetic acid / 3 h / 80 - 88 °C View Scheme

(i) (heating), (ii) aq. NaOH; Multistep reaction;