1: 40 percent / K2CO3 / dimethylsulfoxide / 120 h / Ambient temperature 2: 1) HCO2H; 2) aq. H2O2; 3) KOH / 1) H2O, 70-80 deg C, 10 min; 2) H2O, 25 deg C, 15 h; 3) H2O, 95 deg C, 10 min View Scheme

1: 40 percent / K2CO3 / dimethylsulfoxide / 120 h / Ambient temperature 2: 1) HCO2H; 2) aq. H2O2; 3) KOH / 1) H2O, 70-80 deg C, 10 min; 2) H2O, 25 deg C, 15 h; 3) H2O, 95 deg C, 10 min View Scheme

potassium hydroxide; formic acid; dihydrogen peroxide 1) H2O, 70-80 deg C, 10 min; 2) H2O, 25 deg C, 15 h; 3) H2O, 95 deg C, 10 min; Yield given. Multistep reaction;