Abstract
The corresponding merocyanines, which do not display a tendency to form spiropyran structures, are formed in the condensation of 1,3,3-trimethyl-2-methyleneindoline with 5-methyl-2-furoylacetaldehyde, 2-formylcyclohexanone, or 2-formyl-1-tetralone. Spiran compounds in which the spiropyran—merocyanine equilibrium is shifted markedly to favor the closed form are formed when 4a,9-dimethyl-2,3,4,4a-tetrahydrocarbazone — the cyclic analog of the Fischer base — is used in the reaction with salicylaldehydes and benzoylacetaldehydes.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1205–1210, September, 1982.
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Gal'bershtam, M.A., Sidorov, A.P., Przhiyalgovskaya, N.M. et al. Effect of the inclusion of a cyclic fragment in the chromophore on the properties of a spiropyran-merocyanine system. Chem Heterocycl Compd 18, 923–928 (1982). https://doi.org/10.1007/BF00513433
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DOI: https://doi.org/10.1007/BF00513433