Cauquis, G. published the artcileElectrochemical properties of diphenylamines and of their oxidation products in organic media. III. p,p’-Disubstituted diphenylamines and production of their primary cation radicals, SDS of cas: 1821-27-8, the publication is Electrochimica Acta (1976), 21(8), 557-65, database is CAplus.
The electrochem. oxidation of 2,2′,4,4′-tetramethoxydiphenylamine [7093-78-9] on bright Pt in neutral media, studied by cyclic voltammetry, ESR, and uv spectroscopy, gives 3 waves. The 1st wave corresponds to formation of the stable radical cation [54323-77-2], the 2nd wave to further oxidation to the nitrenium ion [61236-17-7] via the dication, and the final step results in formation of the aryl p-benzoquinoneimine. In 2,6-lutidine the nitrenium ion is observed before conversion to a heptamethoxydihydrophenazine, the exact formula of which is unknown. Oxidation of p,p’-disubstituted diphenylamines, e.g. p,p’-diaminodiphenylamine [537-65-5] in basic media gives the corresponding radical cations. In strong base, these lead to tetraarylhydrazines but in pyridine-like bases and, in some cases, H2O diaryldihydrophenazines are formed.
Electrochimica Acta published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, SDS of cas: 1821-27-8.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia