1: 50 percent / 6 h / Heating 2: Br2, AlCl3, CaCO3 / diethyl ether / 1 h / -3 - 0 °C 3: 35 percent / diethyl ether / 12 h / Ambient temperature View Scheme

1: Br2, AlCl3, CaCO3 / diethyl ether / 1 h / -3 - 0 °C 2: 35 percent / diethyl ether / 12 h / Ambient temperature View Scheme

in diethyl ether 12 h; Ambient temperature;