1: 99 percent / H2 / PtO2 / ethanol / 1.5 h / 20 °C / 760 Torr 2: 72 percent / Na(Hg); Na2HPO4 / methanol / 3 h / 20 °C 3: 95 percent / BH3*Me2S / tetrahydrofuran / 2.5 h / 0 - 20 °C 4: 88 percent / HCl; H2O / tetrahydrofuran / 14 h / 20 °C View Scheme