in dimethyl sulfoxide T=40 - 45°C; 1 h;

1: 100 percent / SOCl2 / benzene / 2.5 h / Heating 2: 98 percent / dimethylsulfoxide / 1 h / 40 - 45 °C View Scheme

1: 99 percent / 97percent NaBH4 / aq. ethanol / 0.5 h / 35 - 40 °C 2: 100 percent / SOCl2 / benzene / 2.5 h / Heating 3: 98 percent / dimethylsulfoxide / 1 h / 40 - 45 °C View Scheme

sulfuric acid T=125°C; 2.5 h;