Abstract
Symmetrical 2,6,2′,6′-tetraphenyl-substituted pyrylo-4- and thiopyrylo-4-cyanines in which both α positions of the polymethine chain are bonded to the β positions of the heterocyclic residues by ethylene or trimethylene groups were synthesized. The introduction of bridged groupings gives rise to a bathochromic effect, which is greater for ethylene groups than for trimethylene groups.
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See [1] for communication 18.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 451–454, April, 1984.
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Kudinova, M.A., Kurdyukov, V.V., Ishchenko, A.A. et al. Pyrylocyanines. 19. Symmetrical pyrylocyanines based on 3,4-polymethylene-2,6-diphenylpyrylium salts. Chem Heterocycl Compd 20, 359–362 (1984). https://doi.org/10.1007/BF00513844
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DOI: https://doi.org/10.1007/BF00513844