1: 98 percent / Ag2O / CH2Cl2 / 2 h 2: 67 percent / NaHCO3 / CH2Cl2; diethyl ether; H2O / 5 h 3: 93 percent / CH2Cl2 / 1 h / Ambient temperature 4: KOH / 1) MeOH, H2O, heating, 15 min, 2) MeOH, H2O, air stream, 10 min 5: conc. HCl / CH2Cl2; diethyl ether / 0.17 h / 20 °C 6: 0.33 h / 150 °C 7: 1 N NaOH, Na2S2O4 / methanol / 0.17 h / Heating 8: conc. H2SO4, H2O / 10 h / 100 °C View Scheme