n-butyllithium 1.) THF, hexane, -78 deg C, 3 h 2.) -78 deg C to 23 deg C, 4 h; Yield given. Multistep reaction;

1: 66 percent / aq NaHSO3 / H2O / 100 °C / 1.) -5 deg C, 105 min 2.) 0 deg C, 33 min, 5N H2SO4 2: 51 percent / SnCl2*2H2O, HCl / acetic acid / 6.75 h / Heating View Scheme