hydrogen; nickel in ethanol T=40 - 70°C; P=79.8 Torr; 0.5 h;

1: With 2,6-dimethylpyridine; trimethylsilyl trifluoromethanesulfonate in dichloromethane T=-78°C; Inert atmosphereCooling with ice; 2: With water; sodium hydrogencarbonate in dichloromethane Inert atmosphere;