Process for making 2-(4'-aminophenyl) 5-amino benzimidazole

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...


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A process for preparing 2-(4'-aminophenyl) 5-amino benzimidazole, a known intermediate used in the synthesis of azo dyes, is disclosed wherein p-nitrobenzoic acid is condensed with aniline, and the N(4'-nitrobenzoyl) aniline produced is dinitrited to N(4'-nitrobenzoyl) 2,4-dinitroaniline; the latter is reduced to the corresponding triamine, which, upon cyclodehydration, results in the 2-(4'-aminophenyl) 5-amino benzimidazole.

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Porai-Koshits, Chem. Abst. 1958, vol. 52, columns 17240-17241.
Noller Chemistry of Organic Compounds, 2nd ed., pp. 160 & 244, Philadelphia, Saunders, 1957.


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