5307-03-9Relevant articles and documents
Process for preparing p-phenylenediamines
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, (2008/06/13)
A process for producing p-phenylenediamine or a derivative thereof which comprises reducing p-nitroaniline or a derivative thereof by hydrazine in the presence of an aromatic quinone compound or an aromatic dihydroxy compound.
Process for the preparation of p-nitroaniline compounds by the alkaline hydrolysis of mixed anilides
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, (2008/06/13)
Process for the preparation of certain substituted p-nitroaniline compounds essentially free of the corresponding o-nitroaniline compounds. The process comprises subjecting an alkanol solution of the anilides of such compounds to alkaline hydrolysis conditions, thereby effecting hydrolysis and precipitation of the p-nitroaniline compound essentially free of the undesired o-isomer. The compounds are intermediates useful in the preparation of azo pigments.