1: 50 percent / dimethylsulfoxide / 2.5 h / 45 °C / Irradiation 2: 34percent hydrogen peroxide, glacial acetic acid / 100 °C 3: tetrabutylammonium acetate / dimethylsulfoxide / controlled-potential electrolysis, mercury pool cathode, 0.1M tetrabutylammonium tetrafluoroborate; reaction without base View Scheme