Levitsky, Harry published the artcileInfrared spectra of the nitration products of diphenylamine, HPLC of Formula: 1821-27-8, the publication is Applied Spectroscopy (1968), 22(5)(Pt. 1), 493-6, database is CAplus.
The ir spectra of the 19 nitration products of diphenylamine were established. A comparison was made of the spectra obtained, and assignments were made to the principal bands. The compounds considered were diphenylamine, N-nitrosodiphenylamine, 4-nitrosodiphenylamine, 2-nitrodiphenylamine, 4-nitrodiphenylamine, N-nitroso-2-nitrodiphenylamine, N-nitroso-4-nitrodiphenylamine, 2,2′-dinitrodiphenylamine, 2,4-dinitrodiphenylamine, 2,4′-dinitrodiphenylamine, 4,4′-dinitrodiphenylamine, N-nitroso-2,4′-dinitrodiphenylamine, N-nitroso-4,4′-dinitrodiphenylamine, 2,2′,4-trinitrodiphenylamine, 2,4,4′-trinitrodiphenylamine, 2,4,6-trinitrodiphenylamine, 2,2′,4,4′-tetranitrodiphenylamine, 2,2′,4,4′,6-pentanitrodiphenylamine, 2,2′,4,4′,6,6,’-hexanitrodiphenylamine, and picrid acid (2,4,6-trinitrophenol).
Applied Spectroscopy 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, HPLC of Formula: 1821-27-8.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia