1: With magnesium; ethylene dibromide in tetrahydrofuran; diethyl ether T=37°C; 3 h; 2: With tri-isopropoxy-borane in tetrahydrofuran; diethyl ether T=-78 - 20°C; 2 h; 3: With hydrogenchloride; water in tetrahydrofuran; diethyl ether 2 h;

1: 4-bromo-4'-tert-butylbiphenyl With magnesium; ethylene dibromide in tetrahydrofuran; diethyl ether 3 h; 2: tri-isopropoxy-borane in tetrahydrofuran; diethyl ether T=-78 - 20°C; 2 h; 3: With hydrogenchloride in tetrahydrofuran; diethyl ether; water 2 h;