Syntheses are reported for a series of N-substituted indolinospiropyrans containing a fused furan fragment in the benzopyran part of the molecule. The structure of these compounds was established by IR and multinuclear NMR spectroscopy. A study was carried out on the effect of the fused benzene ring and bulky N-benzyl substituent on the photochromic properties of these compounds in solution and in a polymer matrix. Dynamic NMR spectroscopy was used to study the thermally induced isomerization of the N-benzyl derivative.
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This work was carried out with the financial support of the Russian Foundation for Basic Research (grant No. 13-03-0631, K. N. Khalanskii; grant No. 13-03-90437, B. S. Lukyanov), State Fund of Fundamental Investigation of Ukraine (grant 53.3/006, L. V. Chepeleva) as well as in the framework of the Basic Part of the State Assignment in Scientific Activity (Physical and Organic Chemistry Research Institute of the Southern Federal University (A. V. Chernyshev, G. S. Borodkin, and M. B. Lukyanov) and the Grant Council of the President of the Russian Federation (grant NSh-274.2014.3).
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*For Communication 41, see [1].
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 797-805, May, 2014.
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Tyurin, R.V., Lukyanov, B.S., Chernyshev, A.V. et al. Photo- and Thermochromic Spiropyrans 42.* The Effect of Structural Factors on the Photochromic Properties of Indolinospiro-Pyrans Containing a Condensed Furan Fragment. Chem Heterocycl Comp 50, 734–741 (2014). https://doi.org/10.1007/s10593-014-1528-x
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DOI: https://doi.org/10.1007/s10593-014-1528-x