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Various substituted benzimidazoles and imidazolo[4,5-b] pyridines 5a-c have been prepared by condensation of appropriate diamines and aldehydes in nitrobenzene. This method has been utilized to synthesize compounds 5f-h, which are analogues of the DNA binding fluorochrome Hoechst 33258.
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Bathini et al. (1990) studied this question.
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