1: 66 percent / (i-Pr)2NEt / CH2Cl2 2: 91 percent / 1M NaOH / methanol 3: 95 percent / MnO2 / CH2Cl2 4: 94 percent / NaOH / ethanol 5: 96 percent / 30percent H2O2, 5percent NaOH / methanol 6: 19 percent / conc. HCl / methanol / 70 °C View Scheme