Proton nmr prediction mestrenova8/15/2023 The two aromatic protons on the benzopyrone, at C 6 and C 8, appear as doublet structures at 6.05 ppm and 6.30 ppm, respectively the multiplicity arises from long-range 4 J HH W-coupling (2 Hz) across the aromatic π-system. The parent structure of a flavonol is a flavone substituted at the 3 position on the benzopyrone with a hydroxy group, making it a 3-hydroxyflavone. This spectrum reveals three types of proton signals: aromatic protons and hydroxy protons of the analyte, and a solvent proton signal. The 82 MHz spectrum of a 9.8% (w/w 0.36 M) solution of Quercetin in protonated DMSO acquired using the Thermo Scientific picoSpin 80 NMR spectrometer. Quercetin (C 15H 10O 7), 3,3',4',5-7-pentahydroxyflavone, is a flavonol, and acts as a pigment in many fruits and vegetables, flowers, and leaves the color of red onions and apples is caused by quercetin.
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