1.1: magnesium bromide dietherate / diethyl ether 1.2: 45 percent / lithium aluminum hydride / diethyl ether / 3 h / -78 - 20 °C 2.1: 88 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / CH2Cl2; H2O / 20 °C 3.1: 82 percent / zinc bromide / CH2Cl2 / 6 h / 20 °C View Scheme

1.1: magnesium bromide dietherate / diethyl ether 1.2: 45 percent / lithium aluminum hydride / diethyl ether / 3 h / -78 - 20 °C 2.1: 75 percent / zinc bromide / CH2Cl2 / 6 h / 20 °C View Scheme