It was found that various thioacetals and thioketals readily reacted with iodosobenzene under mild conditions in methanol to afford the corresponding parent carbonyl compounds in excellent yiels. [Hydroxy(benzeneseleninyloxy)iodo] benzene($\underline{1}$) as a newtrivalent iodine oxidant was prepared and confirmed by its mp, $^1HNMR$, IR, and elemental analysis. Various sulfides were realted with this new oxident to give correponding sulfoxides without formation of sulfones. It was found that various o-nitrophenyl benzene-sulfonamides were prepared form the reaction of benzofuroxans and arylsulfinates under reflux in aqueous acetonitrile in good yields.