dihydrogen peroxide in tetrahydrofuran T=20°C; 1 h;

pyridinium chlorochromate on silica gel in dichloromethane Ambient temperaturesonication;

1: 83 percent / 1,4-diazabicyclo[2.2.2]octane / tetrahydrofuran / 1 h / 20 °C 2: 99 percent / aq. H2O2 / tetrahydrofuran / 1 h / 20 °C View Scheme

1: [bis(trifluoroacetoxy)iodo]benzene / CH2Cl2 / 20 °C 2: 83 percent / 1,4-diazabicyclo[2.2.2]octane / tetrahydrofuran / 1 h / 20 °C 3: 99 percent / aq. H2O2 / tetrahydrofuran / 1 h / 20 °C View Scheme