1.1: 85 percent / Jones reagent / acetone / 6 h / 0 °C 2.1: diphenylphosphoryl azide; Et3N / toluene / 1 h / Heating 3.1: 520 mg / 110 °C 4.1: O3 / CH2Cl2 / -78 °C 4.2: methyl sulfide / CH2Cl2 / 6 h / -78 - 20 °C 5.1: 2-methyl-2-butene; aq. NaClO2; aq. NaH2PO4 / 2-methyl-propan-2-ol / 20 °C View Scheme