BY ROGER ADAMS AND CN WINNICK'o-Phenylenedibenzenesulfmamide was oxidized by means of lead tetraacetate in glacial acetic acid to an ill-defined amorphous product probably formed by dimerization or polymerization of the initial reaction product, o- quinonedibenzenesulfon-imide. When substituents in the phenylenediamine ring were present, oxidation proceeded with the same reagent mixture or with acetic anhydride as ...