期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 424, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2021.113649
关键词
Naphthopyran; Photochromism; Photoswitches; Lactone
资金
- FCT (Fundacao para a Ciencia e a Tecnologia)
- FEDER (program COMPETE) [PTDC/QUI-QOR/28532/2017]
This study presents the acid-catalyzed one-pot condensation process for the synthesis of lactone-fused naphthopyrans from ethyl 5-hydroxynaphtho[1,2-b]furan-3-carboxylate and 1,1-diarylbut-2-yne-1,4-diols, achieving moderate yields. UV irradiation of these colorless compounds in solution produces a brief red coloration that quickly and completely fades in the dark.
The acid-catalyzed one-pot condensation of easily accessible ethyl 5-hydroxynaphtho[1,2-b]furan-3-carboxylate with 1,1-diarylbut-2-yne-1,4-diols provided lactone-fused naphthopyrans in moderate yields. UV irradiation of these colorless compounds in solution, for a few seconds, generates a red coloration that bleaches quickly and completely in the dark (t(1/2) = 4.0 s at 20 degrees C).
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