1: KOH / 1) MeOH, H2O, heating, 2) MeOH, H2O, air stream 2: 95 percent / conc. HCl / CH2Cl2; diethyl ether / 0.17 h 3: 96 percent / 0.33 h / 150 °C 4: 89 percent / 1 N NaOH, Na2S2O4 / methanol / Heating 5: conc. H2SO4, H2O / 100 °C View Scheme

1: KOH / 1) MeOH, H2O, heating, 2) MeOH, H2O, air stream 2: 95 percent / conc. HCl / CH2Cl2; diethyl ether / 0.17 h 3: 96 percent / 0.33 h / 150 °C 4: 89 percent / 1 N NaOH, Na2S2O4 / methanol / Heating View Scheme