1: 97 percent / LiBH4 / tetrahydrofuran / 3 h / Ambient temperature 2: H2 / 10percent Pd/C / ethyl acetate; ethanol / 750.06 Torr / Ambient temperature 3: 91 percent / SO2 / H2O / 120 h / 35 - 40 °C 4: 92 percent / Dowex (OH(1-)) / H2O / 0.75 h 5: 97 percent / H2 / PtO2 / H2O; ethanol / 18 h / 750.06 Torr / Ambient temperature View Scheme