Abstract
Reaction of tropolone and o-benzoquinone dibenzimide was carried out and the structure of its product was determined by deriving it to a 2-phenylbenzimidazole derivative. This revealed that the product is N-(tropolone-5-yl)-N,N′-dibenzoly-o-phennylenediamine. 3-Bromotropolone and 3, 7-dibromotropolone also underwent the same reaction to afford the corresponding bromo derivatives. For the sake of identification, 1-(4′-methoxycarbonylphenyl)-2-phenylbenzimidazole was synthesized from 2-amino-4′-methyldiphenylamine.

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