1: 100 percent / perfluoroacetic acid, Na2HPO4 / CH2Cl2 / Ambient temperature 2: 100 percent / KMnO4 / acetone; H2O / Ambient temperature 3: 1.) (PhO)2PON3, NEt3, 2.) H2O / 1.) C6H6, reflux, 1 h, 2.) reflux, 0.5 h 4: 1.) acetic anhydride, 2.) K2CO3 / 1.) 120-125 deg C, 2 h, 2.) CH3OH, room temperature, 1.5 h 5: 100 percent / MnO2 / CHCl3 / Ambient temperature 6: 46 percent / tetrahydrofuran; hexamethylphosphoric acid triamide / -78 °C 7: 95 percent / activated MnO2 / CHCl3 / Ambient temperature 8: 65 percent / KH / benzene / 2 h / Ambient temperature 9: 90 percent / sodium hydrosulfite / methanol; H2O / 2 h / Heating 10: 90 percent / NaOCH3 / methanol / 0.67 h / 40 °C 11: 90 percent / Fremy's salt / methanol; H2O / 0.17 h / Ambient temperature 13: 80 percent / AlCl3 / CHCl3 / 1 h / Ambient temperature View Scheme