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November 1, 1992Magnetic Resonance in Chemistry

Thermo‐ and photochromic dyes: Spiro(indolinebenzopyrans). 2—detailed assignment of the 1H NMR spectra and structural aspects of the closed form of 1,3,3‐trimethylspiro(indoline‐2,2′‐benzopyrans)

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SKSam‐Rok KeumKorea UniversityKLKi Bong LeeKorea UniversityPKPeter M. KazmaierBar-Ilan University

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Keum et al. (1992) studied this question.

synapsesocial.com/papers/6a8a5c19e0083a7c2c436d6bhttps://doi.org/10.1002/mrc.1260301119
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  1. 1Thermo- and photochromic dyes: indolino-benzospiropyrans. Part 1. UV–VIS spectroscopic studies of 1,3,3-spiro(2H-1-benzopyran-2,2′-indolines) and the open-chain merocyanine forms; solvatochromism and medium effects on spiro ring formation1991 · 110 citations
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  5. 5Photo-decoloration Process of the Reverse Photochromic Spirans1972 · 36 citations