1: 80 percent / NiCl2, NaBH4 / methanol / 0.33 h 2: 64 percent / aq. HCl / tetrahydrofuran / 0.5 h / 40 °C 4: 24 percent / electrochemical oxidation View Scheme

1: 80 percent / NiCl2, NaBH4 / methanol / 0.33 h 2: 54 percent / Ac2O / 48 h / Ambient temperature 3: 82 percent / aq. NaOH / CH2Cl2; methanol / 1 h / Ambient temperature 4: 1.) NaH / 1.) THF, room temperature - 30 min, reflux - 15 min, 2.) THF, room temperature, 20 h 5: 100 percent / aq. NaOH / 24 h / Heating 6: ceric ammonium sulfate 7: NH3 View Scheme