1.1: 82 percent / acetic acid; water; Zn / tetrahydrofuran / 2 h / 0 °C 2.1: 84 percent / LiAlH4 / tetrahydrofuran / 2.5 h / Heating 3.1: 88 percent / tetrabromomethane; triphenylphosphane / CH2Cl2 / 0 - 20 °C 4.1: Mg; 1,2-dibromoethane / tetrahydrofuran / 3.5 h / Heating 4.2: 58 percent / Li2CuCl4 / tetrahydrofuran / -20 °C View Scheme