Abstract
Unsymmetrical flavyloindotrimethylidynecyanines in which a methoxy group is located alternately in the 5, 6, 7, 8, 2′, 3′, and 4′ positions of the flavylium ring were synthesized. An increase in the electron-donor character of the heterocyclic residue generally leads to a bathochromic shift of the absorption bands of the dyes and a decrease in the widths of these bands and the ratios of the intensities of the short-wave and long-wave maxima in them.
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See [1] for communication 17.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1189–1191, September, 1983.
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Gavrilyuk, I.M., Ishchenko, A.A., Kudinova, M.A. et al. Pyrylocyanines. 18. Unsymmetrical flavylocyanines on the basis of methoxysubstituted 4-methylflavylium salts. Chem Heterocycl Compd 19, 948–950 (1983). https://doi.org/10.1007/BF00506876
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DOI: https://doi.org/10.1007/BF00506876