^13C Nuclear Magnetic Resonance Spectra of Hydrolyzable Tannins. III. : Tannins Having ^1C_4 Glucose and C-Glucosidic Linkage

概要

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Two-dimensional (2D) nuclear magnetic resonance (NMR) spectroscopy was utillized for the assignments of the glucose carbon signals in the ^<13>C-NMR spectra of hydrolyzable tannins in which the glucopyranose core takes a ^1C_4 or related boat conformation, and of tannins possessing a C-glucosidic linkage. Remarkable changes in the sequences of glucose carbons were observed with change in the conformation of the glucose core, and with the formation of a C-glucosidic linkave.The chemical shifts of the C-2 signals of the glucose cores adopting the open-chain form in C-glucosidic tannins and in complex tannins can be utilized for the discrimination of the configurations at C-1 in these tannins.
社団法人日本薬学会の論文
1988-10-25