1: 66 percent / CaCO3 / benzene / 24 h / Heating 2: Br2, AlCl3, CaCO3 / diethyl ether / 1 h / Heating 3: 34 percent / diethyl ether / 12 h / Ambient temperature View Scheme

1: Br2, AlCl3, CaCO3 / diethyl ether / 1 h / Heating 2: 34 percent / diethyl ether / 12 h / Ambient temperature View Scheme

in diethyl ether 12 h; Ambient temperature;