dihydrogen peroxide in tetrahydrofuran 1.) 0 deg C, 4 h, 2.) room temperature, 4 h;

1: 62.7 percent / neat (no solvent) / 1.) heated at 60 deg C and melted, 2.) room temperature until mixture solidified (12-24 h) 2: 32.3 percent / methanol / 1.) room temperature, 1 h, 2.) reflux, 7 h 3: 66 percent / 35 percent aq. hydrogen peroxide / tetrahydrofuran / 1.) 0 deg C, 4 h, 2.) room temperature, 4 h View Scheme