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SYNTHESIS AND FLUORESCENCE STUDY OF A SERIES OF 4-HYDROXYCOUMARIN O-ACYLATION DERIVATIVES
Abdoulaye Djandé*, Lamine Cissé, Jules Yoda, Léopold Kaboré and Fabrice Duvernay
ABSTRACT Some coumarin derivatives were synthesized starting from 4-hydroxycoumarin and benzoyl chlorides. The structures of the obtained compounds were confirmed by mass and NMR spectra. Additionally, their crystal structures were determined by X-ray diffractometry, excepting the compound C1. Absorption and fluorescence spectra of these derivatives have been investigated in acetonitrile medium. The effects of various electron donating substituents R on fluorescence emission were examined. As a result, compound C5 with an electron-donating substituent dimethyl amino (R = Me2N) exhibited the strongest fluorescence. Keywords: 4-hydroxycoumarin, O-acylation, (coumarin-4-yl)-benzoates, fluorescence, substituent R. [Download Article] [Download Certifiate] |