Abstract
Unsymmetrical 4,6-diphenylpyrylo-2- and 2,6-diphenylpyrylo-4-carbo- and -dicarbocyanines, as well as the analogous pyridocyanines containing 3-ethylbenzothiazolium and 1,3,3-trimethyl-3H-indolium residues, were synthesized. The pyrylo-2-cyanines are more deeply colored than the corresponding 4 isomers, and their absorption bands are distinguished by lower intensities and greater widths. On the basis of data on the increase in the width of the absorption bands of unsymmetrical dyes as the length of their polymethine chain increases it is concluded that the α-pyran system has greater electron-donor character than the γ-pyran system. The regularities observed in the pyridocyanine series are just the opposite of these.
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See [1] for Communication 11.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 903–908, July, 1980.
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Kudinova, M.A., Derevyanko, N.A., Dyadyusha, G.G. et al. Pyrylocyanines. 12. Unsymmetrical pyrylo-2-cyanines. Chem Heterocycl Compd 16, 696–701 (1980). https://doi.org/10.1007/BF00557738
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DOI: https://doi.org/10.1007/BF00557738