1: sodium amalgam; disodium hydrogenphosphate / methanol / 1 h / 20 °C / |Inert atmosphere 2: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione / ethyl acetate / 1 h / |Reflux; |Inert atmosphere View Scheme

manganese(IV) oxide in 1,2-dichloro-ethane 12 h; Heating; Yield given;