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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
Article

Abstract

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.

Keywords

Sodium Organic Chemistry Vinylene Absorption Maximum Steric Hindrance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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