4-Nitrodiphenylamine, is used as a Hammett indicator. It is also used as an Intermediate in the production of rubber antioxidants. It is manufactured solely for use as a chemical intermediate for industrial uses and thus is essentially fully consumed in chemical reductive alkylation reaction downstream of manufacture.
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AA Banerjee.; D Mukesh. Heterogeneous catalytic transfer hydrogenation of 4-nitrodiphenylamine to p-phenylenediamines. Journal of the American Chemical Society. 19881 (18) , 1275-1276.
Hammett indicator. Intermediate in the production of rubber antioxidants.