Abstract
Some methoxy-substituted styrils of the flavylium series have been synthesized. Simple HMO quantum chemical calculations have shown that the terminal rings in these dyes are largely isolated in consequence of the low order of the C(4)-C(α) bond. The latter is responsible for and explains the unexpected effects on the positions and widths of the absorption bands consequent upon the introduction of electrondonor CH3O groups into the heterocyclic nucleus.
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For Communication 21, see [1].
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 886–890, July, 1986.
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Gavrilyuk, I.M., Ishchenko, A.A., Kudinova, M.A. et al. Pyrylocyanines. 22. Styrils derived from methoxy-substituted 4-methylflavylium salts. Chem Heterocycl Compd 22, 703–707 (1986). https://doi.org/10.1007/BF00522726
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DOI: https://doi.org/10.1007/BF00522726