A series of 2‐amino‐benzimidazoles with various substituents in position 1 and at the amino group has been prepared. The methods used are the displacement of chlorine by an amino group in the position 2 of the benzimidazole ring and the condensation of o‐phenylenediamines with carbodiimides or S‐methyl‐isothioureas.
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Hunger et al. (1961) studied this question.
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