Chemistry of Heterocyclic Compounds

, Volume 6, Issue 5, pp 624–627 | Cite as

IR spectra and structure of 2- imino-1,3-dimethylbenzimidazolines

  • O. E. Shelepin
  • V. G. Sayapin
  • N. K. Chub
  • A. M. Simonov


The fine structure of some N-substituted 2-imino-1,3-dimethyl-benzimidazolines is examined with the aid of IR spectroscopy. It is shown that the introduction of an alkyl or phenyl group into the imino group does not affect the C=N group or the imidazoline ring structure. In salts of 2-imino-1,3-dimethylbenzimidazoline and its N-substituted derivatives, the heterocyclic system has the benzimidazolium structure. The structure of 2-imino-1,3-dimethylbenzimidazolines in which the exocyclic nitrogen atom has electrophilic substituents which are conjugated with the heterocycle is characterized by a considerable contribution from dipolar forms, with the imidazole ring bearing a positive charge.


Phenyl Imidazole Nitrogen Atom Fine Structure Positive Charge 
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Copyright information

© Consultants Bureau, a division of Plenum Publishing Corporation 1973

Authors and Affiliations

  • O. E. Shelepin
    • 1
  • V. G. Sayapin
    • 1
  • N. K. Chub
    • 1
  • A. M. Simonov
    • 1
  1. 1.Rostov-on-Don State UniversityUSSR

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