Abstract
The Duff formylation of 5-bromo- or 5-chloro-8-hydroxyquinoline leads to the corresponding 7-formyl derivatives, condensation of which with 2-methyleneindolines or 3H-indolium halides in the presence of a base afforded new photochromic 6′-halo-substituted spiro[indoline-2,2′-2H- pyrano[3,2-h]quinolines]. Thermal and photo-induced isomerization of compounds obtained have been investigated by 1H NMR and UV spectroscopy.
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For Part 3, see Ref. 1.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 146–153, January, 2008.
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Voloshin, N.A., Chernyshev, A.V., Bezuglyi, S.O. et al. Spiropyrans and spirooxazines. Russ Chem Bull 57, 151–158 (2008). https://doi.org/10.1007/s11172-008-0022-y
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DOI: https://doi.org/10.1007/s11172-008-0022-y