1.1: 91 percent / Br2 / CCl4 / Heating 2.1: BuLi; 2,2,6,6-tetramethypiperidine / tetrahydrofuran / -75 °C 2.2: 6.5 percent / tetrahydrofuran / -75 °C View Scheme

bromine in tetrachloromethane Heating;