AlCl3, aluminium chloride in dichloromethane T=0°C; 1 h;

hydrogenchloride in sodium hydroxide; dichloromethane

aluminum tri-bromide in dichloromethane T=0 - 15°C; 1.75 h;

1: acetic acid; cesium fluoride / N,N-dimethyl-formamide / 0.67 h / 0 °C 2: tetrabutyl ammonium fluoride / tetrahydrofuran / 1 h 3: sodium hydroxide / 20 °C 4: triethylamine; methanesulfonyl chloride / dichloromethane / 20 h / 0 - 20 °C View Scheme

lithium aluminium tetrahydride in diethyl ether T=20 - 50°C; 3 h; Heating / reflux;