Summary
The high values for the intensity of infrared bands of the C=O group in a number of carbonyl-containing heterocyclic compounds (pyridones, quinolones, pyrones, etc.) shows the increased polarity of the exocyclic C=O bond in these compounds. This permits us to consider them to a definite degree as aromatic compounds in the same way as is done for tropones, sydnones, and diphenylcyclopropenone.
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We take this opportunity to thank N. P. Posherina for kindly supplying theα-pyrones.
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Zaitsev, B.E., Sheinker, Y.N. The intensity of the C=O band in the infrared spectra of some carbonyl-containing heterocyclic compounds. Russ Chem Bull 11, 1976–1978 (1962). https://doi.org/10.1007/BF00921358
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DOI: https://doi.org/10.1007/BF00921358