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A new convenient method for the conversion of 2-nitroanilines into benzimidazoles by two-step one-pot procedure is reported. The procedure involves the reduction of nitro group followed by the intramolecular cyclisation of the corresponding o-phenylenediamines utilising thiourea dioxide and sodium hydroxide at 70 °C in mixed solvents of H 2 O and EtOH (v/v, 3/1). The yields are good to excellent and the workup is simple.
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Pu et al. (2014) studied this question.
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