Abstract
Abstractmagnified imageTsOH/graphite and N,N‐dimethylaniline/graphite were found to be catalyst systems for condensation reaction of o‐phenylendiamine with different aldehydes to form benzimidazole derivatives under mild and simple conditions. The graphite was easily recovered by a simple extraction and could be reused without decrease of activity in the presence of fresh TsOH and N,N‐dimethylaniline.
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