n-butyllithium 1) diethylether, hexane, a) -78 deg C, 15 min, b) 0 deg C, 30 min, 2) a) -78 deg C, 0.5 h, b) room temp., 12 h; Yield given. Multistep reaction;

1: 90 percent / CH2Cl2 / 2 h / Ambient temperature 2: 79 percent / thionyl chloride / benzene / 12 h / Ambient temperature 3: 1.) BuLi / 1) THF, HMPA, hexane, -78 deg C, 0.5 h; 2) THF, HMPA, hexane, -78 deg C, 0.25 h View Scheme

1: 95 percent / thionyl chloride / 3 h / Heating 2: 90 percent / CH2Cl2 / 2 h / Ambient temperature 3: 79 percent / thionyl chloride / benzene / 12 h / Ambient temperature 4: 1.) BuLi / 1) THF, HMPA, hexane, -78 deg C, 0.5 h; 2) THF, HMPA, hexane, -78 deg C, 0.25 h View Scheme

1: 79 percent / thionyl chloride / benzene / 12 h / Ambient temperature 2: 1.) BuLi / 1) THF, HMPA, hexane, -78 deg C, 0.5 h; 2) THF, HMPA, hexane, -78 deg C, 0.25 h View Scheme