N-Substituted tetrazole was attempted to formylate which led to the formation of a novel triazene by opening of
tetrazole ring via unusual Vilsmeir-Haack reaction. The formed product was proved by spectral analyses and X-Ray diffraction
Keywords: Sydnone, triazole, terazole, formylation, iminium cation, Vilsmeir-Haack reaction.
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