1: With benzophenone in benzene 120 h; Inert atmosphereIrradiation; 2: With potassium hydroxide in methanol Cooling with iceReflux; 3: With hydrogenchloride in methanol; water T=0°C;

1: With boron tribromide in dichloromethane T=-78 - 20°C; 2: With water in dichloromethane T=0°C;