K5IO6; sulfuric acid in ethanol 1.) 0 deg C, 2 h, 2.) 0 deg C to room temperature;

1: 5.2 g / K5IO6, aq. H2SO4 / ethanol / 1.) 0 deg C, 2 h, 2.) 0 deg C to room temperature 2: 9.5 g / K2CO3 / acetone / 3 h / Heating 3: LiCl / H2O; dimethylsulfoxide / 2 h / 165 °C 4: LiAlH4 / diethyl ether / 2 h / Heating 5: MnO2 / benzene / 12 h / Heating View Scheme