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- W3032387826 abstract "We probed tandem aldol condensations of sixteen o-hydroxyacetophenones, carrying electron-withdrawing and -donating groups at positions 4 and 5, using five molar equivalents of SiCl4 in anhydrous ethanol. Substrates carrying electron-withdrawing groups (EWGs) (0 < ∑σ > 0.63) populated the equilibria with isospiropyrans (12–74% yield), while those carrying electron-donating groups (EDGs) (∑σ < −0.31) gave flavylium salts (50–80%) or thermochromic bis-spiropyrans (73%). The results are of interest for developing novel organic materials possessing switchable photochromic and thermochromic characteristics." @default.
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- W3032387826 date "2020-05-29" @default.
- W3032387826 modified "2023-09-27" @default.
- W3032387826 title "One-Pot Aldol Cascade for the Preparation of Isospiropyrans, Flavylium Salts, and bis-Spiropyrans" @default.
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- W3032387826 doi "https://doi.org/10.1021/acs.joc.0c00825" @default.
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