(Chemical Equation Presented) Flash vacuum pyrolysis (FVP) of 1-acylbenzotriazole phenylhydrazones gave benzonitriles, aniline and 2-arylbenzimidazole derivatives. Static pyrolysis of the same substrates at 180°C gave exclusively the corresponding N-anilino-2-arylbenzimidazole derivatives. Pyrolysis of the isomeric 2-acylbenzotriazole phenylhydrazones gave similar products.
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Al-Awadi, H., Ibrahim, M. R., Al-Awadi, N. A., & Ibrahim, Y. A. (2008). Gas-phase thermolysis of benzotriazole derivatives. Part 4. Pyrolysis of 1-acylbenzotriazole phenylhydrazones. Interesting direct routes towards N-aminobenzimidazoles. Journal of Heterocyclic Chemistry, 45(3), 723–727. https://doi.org/10.1002/jhet.5570450314