1: lithium borohydride / tetrahydrofuran 2: H2O*C2H5NO2*HOMo(O2)OMo(O3); dihydrogen peroxide / diethyl ether / 11 h / 20 °C 3: toluene-4-sulfonic acid / dichloromethane / 1.5 h / 20 °C 4: iodine / cyclohexane / 35 h / 20 °C 5: ruthenium trichloride; sodium periodate View Scheme