1: thionyl chloride / CHCl3 / 0 - 20 °C 2: 1.) n-BuLi / 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, hexane, from -78 deg C to RT, overnigh 3: 64 percent / 3 N aq. HCl / Heating 4: 70 percent / LiAlH4 View Scheme