1: NaIO4 / methanol; H2O / 5 h / 60 °C 2: 40 percent / t-BuOK / CCl4; 2-methyl-propan-2-ol / 50 °C 3: p-TsOH*pyridine / acetone; H2O / Heating View Scheme

1: p-TsOH / benzene / 5 h / Heating 2: NaIO4 / methanol; H2O / 5 h / 60 °C 3: 40 percent / t-BuOK / CCl4; 2-methyl-propan-2-ol / 50 °C 4: p-TsOH*pyridine / acetone; H2O / Heating View Scheme

1: 40 percent / t-BuOK / CCl4; 2-methyl-propan-2-ol / 50 °C 2: p-TsOH*pyridine / acetone; H2O / Heating View Scheme

1: 92 percent / 2,2-dimethoxypropane, p-toluenesulfonic acid / benzene / 6 h / Heating 2: p-toluenesulfonic acid / benzene / 4 h / Heating 3: sodium periodate / H2O; methanol / 10 h / 60 °C 4: 73 percent / potassium tert-butoxide / CCl4; 2-methyl-propan-2-ol / 20 h / 50 - 55 °C 5: pyridinium p-toluenesulfonate, water / acetone / 24 h / Heating View Scheme