lithium aluminium tetrahydride in diethyl ether R.T, 2 h then reflux, 2 h;

1: 91 percent / 1-chlorobenzotriazole / CH2Cl2 / 17 h / Ambient temperature 2: 93 percent / potassium hydride, 18-crown-6 / benzene / 2 h / Ambient temperature 3: 87 percent / LiAlH4 / diethyl ether / R.T, 2 h then reflux, 2 h View Scheme

1: 69 percent / NCS / 2-methyl-propan-2-ol / 17 h / 50 °C 2: 87 percent / LiAlH4 / diethyl ether / R.T, 2 h then reflux, 2 h View Scheme

1: 93 percent / potassium hydride, 18-crown-6 / benzene / 2 h / Ambient temperature 2: 87 percent / LiAlH4 / diethyl ether / R.T, 2 h then reflux, 2 h View Scheme