Abstract
Novel series of photochromic indoline and benzoxazine spiropyrans containing ortho-placed formyl and hydroxyl groups in the benzene ring of the chromene part of the molecule have been prepared. X-ray analysis has shown that, depending on the structure of the heterocyclic component in the spiro cyclization reaction different, nonequivalent formyl groups of 2,4-dihydroxyisophthalaldehyde can participate. The synthesized compounds were used as original analogs of salicylaldehyde. The novel photochromic bispyropyrans prepared contain two different asymmetric spiro carbon atoms.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 919–929, June, 2006.
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Alekseenko, Y.S., Lukyanov, B.S., Utenyshev, A.N. et al. Photo-and thermochromic spiranes. 24. Novel photochromic spiropyrans from 2,4-dihydroxyisophthalaldehyde. Chem Heterocycl Compd 42, 803–812 (2006). https://doi.org/10.1007/s10593-006-0165-4
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DOI: https://doi.org/10.1007/s10593-006-0165-4