13C-NMR spectroscopy of biflavanoids |
| |
| Authors: | Vedantha Mohan Chari Mohammed Ilyas Hildebert Wagner András Neszmélyi |
| |
| Institution: | 1. Institut für Pharmazeutische Arzneimittellehre der Universität München, 8 München 2, BRD Germany;2. Central Research Institute for Chemistry, Hungarian Academy of Sciences, Budapest, 114, P.O.B. 17, Hungary |
| |
| Abstract: | The 13C-NMR spectra of nine naturally occurring CC linked biflavanoids have been assigned. The signals for the carbon atoms I-6, I-8, II-6, and II-8 appear in the region 90.0 ppm to 105.0 ppm. On the basis of the chemical shifts of these signals and their multiplicities in the off-resonance spectra, it is possible to determine the interflavonoid linkage in biflavanoids, provided that the A ring is involved. The level of oxidation of the ring C can be readily determined by a consideration of the chemical shift value of the carbonyl resonances. The position of the methoxyl substitution can also be inferred. |
| |
| Keywords: | naturally occurring CC linked biflavanoids |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
