Magnetic Resonance in Chemistry 2006-Jul
Solvent effect in 1H NMR spectra of 3'-hydroxy-4'-methoxy isoflavonoids from Astragalus membranaceus var. mongholicus.
Only registered users can translate articles
Log In/Sign up
The link is saved to the clipboard
Keywords
Abstract
Four 3'-hydroxy-4'-methoxy-isoflavonoids: calycosin-7-O-beta-D-glucopyranoside (1), calycosin (2), pratensein-7-O-beta-D-glucopyranoside (3), and pratensein (4) were isolated from Astragalus membranaceus var. mongholicus, among which compound 4 was obtained from this plant for the first time. The solvent effect obscuring (1)H signal patterns of B ring of compounds 1-4 was reported to avoid mis-assignments. Previously reported NMR data of compounds 1 and 2 were corrected based on 1D and 2D NMR experiments.