1: SO3*Py, Et3N / dimethylsulfoxide 2: NaClO2, NaH2PO4*2H2O, 2-methyl-2-butene / 2-methyl-propan-2-ol; H2O 3: CH2Cl2 4: 98 percent / AcCl / methanol View Scheme

1: SO3*Py, Et3N / dimethylsulfoxide 2: NaClO2, NaH2PO4*2H2O, 2-methyl-2-butene / 2-methyl-propan-2-ol; H2O 3: CH2Cl2 4: 98 percent / AcCl / methanol 5: 96 percent / aq. 1 M NaOH / tetrahydrofuran; H2O View Scheme