hydrogenchloride; HPF6; sodium nitrite in water T=-10 - -5°C; 0.5 h;

1: With tri-isopropoxy-borane in diethyl ether T=-78°C; Inert atmosphere; 2: With tert.-butyl lithium in diethyl ether; pentane T=-10°C; 0.5 h; 3: With hydrogenchloride in diethyl ether; pentane T=20°C; 0.5 h;