1: 76 percent / MnO2 / benzene / 36 h / Ambient temperature 2: 80 percent / LiClO4 / 45 °C / electrolysis at 0.06 A, 10 V 3: 90 percent / H2 / 5percent Pd/C / ethyl acetate / 6 h / 760 Torr / Ambient temperature 4: 48 percent / aq. 0.1 M HCl / dioxane; H2O / 24 h / Heating View Scheme

1: 76 percent / MnO2 / benzene / 36 h / Ambient temperature 2: 80 percent / LiClO4 / 45 °C / electrolysis at 0.06 A, 10 V 3: 90 percent / H2 / 5percent Pd/C / ethyl acetate / 6 h / 760 Torr / Ambient temperature 4: 86 percent / aq. 1 M HCl / dioxane / 10 h / Heating View Scheme