Abstract
A number of photochromic 1-carbethoxymethyl-3,3-dimethyl-6′-nitroindoline-2-spiro-2′-2H-chromenes were synthesized. The introduction of a carbethoxymethyl substituent at the nitrogen atom instead of a methyl group somewhat increases the rate of dark decolorization of the photomerocyanines without appreciably affecting the spectral characteristics. The results are compared with the analogous spectral-kinetic characteristics of 1-phenyl-substituted compounds.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1640–1644, December, 1977.
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Gal'bershtam, M.A., Przhiyalgovskaya, N.M., Khrolova, O.R. et al. Photochromic properties of some N-substituted 3,3-dimethyl-6′-nitroindoline-2-spiro-2′-2H-chromenes. Chem Heterocycl Compd 13, 1309–1313 (1977). https://doi.org/10.1007/BF00469891
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DOI: https://doi.org/10.1007/BF00469891