Abstract
Isomeric 2-methyl-4-phenyl-6-tert-butylpyrylium and 2-methyl-4-tert-butyl-6-phenylpyrylium salts and their sulfur analogs were synthesized. From these, symmetrical α-pyrylium and α-thiopyrylium carbo- and dicarbocyanins were obtained. α-Pyrylocyanins were converted into symmetrical α-pyridocyanins. From a comparison of the experimental spectral characteristics of the above dyes with the results of quantum-chemical calculations of the average positions of the absorption bands and the quadratic changes of the bond orders during excitation, the influence of the phenyl substituent in the 2- and 4-positions of the heteroresidue on the color was analyzed.
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See [1] for Communication 25.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 902–908, July, 1990.
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Kudinova, M.A., Kurdyukov, V.V., Ishchenko, A.A. et al. Pyrylocyanins. 26. Symmetrical di-tert-butyldiphenyl-substituted pyrylo-2-cyanins. Chem Heterocycl Compd 26, 750–756 (1990). https://doi.org/10.1007/BF00509701
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DOI: https://doi.org/10.1007/BF00509701