+ Phenylenediamine and p-phenylenediamine, on oxidation with manganese dioxide, gave the corresponding diaminoazo compounds. Under similar conditions, 2, 2'-diaminobiphenyl gave dibenzopyridazine, whereas o, o'-diaminobiphenyl sulfide gave a linear azo compound. The oxidation of N-phenyl-p-phenylenediamine and N, N'-diphenyl-p- phenylenediamine gave N-phenyl-p-benzoquinone monoimine and N, N'-diphenyl-p- ...
