1: 36 percent / Et3N / benzene / 2.25 h / 0 °C 2: 71 percent / 1 N HCl / methanol / 0.08 h / 20 °C 3: 73 percent / NaBH4, 0.4 M methanolic CeCl3*7H2O / 0.17 h / 0 °C 4: 100 percent / 2 N aq. HCl / methanol / 48 h / 20 °C View Scheme