1: 1.) sec-butyllithium, hexamethylphosphoramide / 1.) THF, -78 deg C, 2h, 2.) 0 deg C, 1h 2: 71 percent / nickel chloride hexahydrate / 2-methyl-propan-2-ol; H2O / 26 h / 60 °C 3: Raney nickel / ethanol / 4 h / 50 °C 4: p-toluenesulfonic acid monohydrate / ethanol / 1 h / 25 °C View Scheme