potassium carbonate in acetone 24 h; Heating;

1: 89 percent / Br2 / CCl4 / 24 h / 20 °C 2: 76 percent / K2CO3 / acetone / 24 h / Heating View Scheme

1: With n-butyllithium in tetrahydrofuran; diethyl ether; hexane T=-98°C; 0.0833333 h; 2: With boric acid trimethyl ester in tetrahydrofuran; diethyl ether; hexane T=-98 - 20°C; 12 h; 3: With hydrogenchloride in tetrahydrofuran; diethyl ether; hexane T=20°C;