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NMR assignments of ellagic acid derivatives

✍ Scribed by Xing-Cong Li; Hala N. Elsohly; Charles D. Hufford; Alice M. Clark

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 62 KB
Volume: 37
Category: Article
ISSN: 0749-1581
DOI: 10.1002/(sici)1097-458x(199911)37:11<856::aid-mrc529>3.0.co;2-x

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✦ Synopsis

HMBC spectroscopy optimized for small couplings was employed to determine the four-bond and twobond proton carbon correlations on the aromatic rings of ellagic acid derivatives. Complete 13 C NMR assignments of 3 0 -O-methyl-3,4-methylenedioxyellagic acid 4 0 -O-ˇ-D-glucopyranoside (1), 3,3 0 -di-O-methylellagic acid 4 0 -O-ˇ-Dxylopyranoside (2), 3,3 0 ,4-tri-O-methylellagic acid 4 0 -O-ˇ-D-glucopyranoside (3) and ellagic acid (4) were achieved using this technique. This study indicates that optimization of the delay time in the HMBC spectrum is crucial in assigning the 13 C NMR signals of phenolic compounds with highly oxygenated quaternary carbons.

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