Abstract
Calculation by the LCAO MO method showed that the formation and stability of spiropyrans obtained by the condensation of quaternary salts of nitrogen heterocycles with salicylaldehyde depend on the magnitude of the positive charge on the carbon atom at which the pyran ring is closed and on the magnitude of the localization energy of this reaction center. New representatives of spiropyrans based on 5,10-dimethyl-4,9-diazapyrene were synthesized.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 447–450, April, 1971.
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Veksler, K.V., Zakhs, É.R., Treiger, V.M. et al. Spiroypyrans from nitrogen heterocycles application of the Mo method. Chem Heterocycl Compd 7, 416–419 (1971). https://doi.org/10.1007/BF00471474
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DOI: https://doi.org/10.1007/BF00471474