1: 78.7 percent / tetrahydrofuran; diethyl ether / 1 h / 0 °C 2: 63.9 percent / LiNH2, NH3 / tetrahydrofuran / 5 h / -33 °C 3: 1.) (CF3CO)2O, 2.) KOH / 1.) CF3CO2H, - 18 deg C, 2 h, 2.) EtOH, room temperature, 4 h View Scheme