Beilstein J. Org. Chem.2015,11, 2179–2188, doi:10.3762/bjoc.11.236
diffraction. 2-(2-Benzoxa(thia)zolyl)-6-alkoxycarbonylphenols display intense green fluorescence with anomalous Stokes shifts caused by the excited state intramolecular proton transfer (ESIPT) effects.
Keywords: β-tropolones; fluorescence; intramolecular hydrogen bond; tautomerism; X-ray analysis
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Graphical Abstract
Scheme 1:
1,3-Tropolones 2–4 prepared by the reaction of o-chloranil with methylene active compounds.