1: 95 percent / aq. NaOH / 4 h / 25 °C 2: 82 percent / aq. NaOH, H2O2 / 4 h / 25 °C 3: K2CO3, cupric oxide / 5.5 h / 110 °C 4: 1.) butyllithium / 1.) hexane, ether, from -20 deg C to -10 deg C, 30 min, 2.) hexane, ether, RT, 30 min View Scheme

sodium hydrogencarbonate in methanol Deacetylation; 2 h;

1: 98 percent / aq. NaHCO3 / methanol / 2 h 2: 64 percent / 30 percent aq. H2O2; aq. NaOH View Scheme

1: 95 percent / aq. NaOH / 4 h / 25 °C 2: 82 percent / aq. NaOH, H2O2 / 4 h / 25 °C 3: K2CO3, cupric oxide / 5.5 h / 110 °C View Scheme