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Chemistry of Heterocyclic Compounds

, Volume 14, Issue 6, pp 601–605 | Cite as

Pyrylocyanines

VIII. Tetraalkyl-substituted 4-pyrylocyanines
  • A. I. Tolmachev
  • G. G. Dyadyusha
  • E. F. Karaban
  • A. A. Ishchenko
  • N. A. Derevyanko
Article

Abstract

Tetraalkyl-substituted 4-pyrolocyanines were synthesized and converted to pyridocyanines by reaction with methylamine. The exchange reaction proceeds particularly readily in the series of tetramethyl-substituted compounds, in which the oxygen atoms in one or both pyrylium residues can be replaced, depending on the conditions. It was established that, in contrast to the tetraphenyl-substituted compounds, among the tetramethyl-substituted compounds the symmetrical dyes (pyridinium derivatives) are more deeply colored than their oxygen-containing analogs. The reasons for this difference in the absorption spectra are analyzed thoroughly by the quantum-chemical method.

Keywords

Oxygen Organic Chemistry Absorption Spectrum Pyridinium Oxygen Atom 
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

© Plenum Publishing Corporation 1978

Authors and Affiliations

  • A. I. Tolmachev
    • 1
  • G. G. Dyadyusha
    • 1
  • E. F. Karaban
    • 1
  • A. A. Ishchenko
    • 1
  • N. A. Derevyanko
    • 1
  1. 1.Institute of Organic ChemistryAcademy of Sciences of the Ukrainian SSRKiev

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