1: 100 percent / toluene-p-sulphonic acid / benzene / 0.25 h / Heating; Irradiation 2: 96 percent / sodium metaperiodate / methanol; H2O / 21 h 3: 53 percent / thiophenol, sodium hydroxide / methanol / 24 h / Heating View Scheme

tetraethylammonium p-toluenesulfonate in N,N-dimethyl-formamide (electrochemical reduction);