1: 81 percent / aq. NaOH / methanol / 10 h / Heating 2: 26 percent / H2O2, aq. NaOH / methanol / 12 h 3: 1.00 g / pyridinium chlorochromate, NaOAc 4: 59 percent / Bu4NF / tetrahydrofuran / 5 h 5: 90 percent / pyridinium chlorochromate, NaOAc 6: 3 percent / H2SO4 / acetone; H2O / 72 h View Scheme