The infrared spectra of the 19 nitration products of diphenylamine were established. A comparison was made of the spectra obtained and assignments were made to the principle bands. The compounds considered were diphenylamine, <i>N</i>-nitrosodiphenylamine, 4-nitrosodiphenylamine, 2-nitrodiphenylamine, 4-nitrodiphenylamine, <i>N</i>-nitroso-2-nitrodiphenylamine, <i>N</i>-nitroso-4-nitrodiphenylamine, 2,2'-dinitrodiphenylamine, 2,4-dinitrodiphenylamine, 2,4'-dinitrodiphenylamine, 4,4'-dinitrodiphenylamine, <i>N</i>-nitroso-2,4'-dinitrodiphenylamine, <i>N</i>-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 picric acid (2,4,6-trinitrophenol).

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