1: With n-butyllithium in tetrahydrofuran; diethyl ether T=-78°C; 0.0333333 h; 2: With tri-isopropoxy-borane in tetrahydrofuran; diethyl ether T=-78 - 20°C; 3: With hydrogenchloride in tetrahydrofuran; diethyl ether 0.5 h; Further stages.;

1: With boron tribromide in dichloromethane T=0°C; 2 h; 2: With water in dichloromethane Cooling with ice;