Chemistry of Heterocyclic Compounds

, Volume 3, Issue 5, pp 723–726 | Cite as

Isoelectronic analogs of indolizine

V. Derivatives of pyrrolo[1, 2-a]benzimidazole
  • F. S. Babichev
  • A. F. Babicheva


A new method is offered for synthesizing hitherto unknown compounds of the pyrrolo[1, 2-a]benzimidazole series, involving heating quaternary salts prepared from 1, 2-dialkylbenzimidazoles and α-halogenoketones with sodium carbonate solution. The method is used to prepare 6 bases iso-electronic with the corresponding indolizine derivatives. The salts of the pyrrolo[1, 2-a]benzimidazoles give 2 series of cyanine dyes, those with a chain at the 1,1′ positions, and those with one at the 3, 3′ positions. The anomalous value of the vinylene shift of the absorption maximum observed on passing from monomethine- to trimethinecyanines, is due to steric hindrance in molecules of monomethinecyanines.


Sodium Organic Chemistry Vinylene Absorption Maximum Steric Hindrance 
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Copyright information

© The Faraday Press, Inc. 1969

Authors and Affiliations

  • F. S. Babichev
    • 1
  • A. F. Babicheva
    • 1
  1. 1.Kiev State UniversityUSSR

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