1: p-toluenesulfonic acid / benzene / 4 h / Heating 2: sodium periodate / H2O; methanol / 10 h / 60 °C 3: 100 percent / hydrogen / platinum oxide / ethanol 4: 50 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

Multi-step reaction with 2 steps 1: p-toluenesulfonic acid / benzene / 4 h / Heating2: sodium periodate / H2O; methanol / 10 h / 60 °C