Abstract
Spinosin, a C-glycoside flavonoid, was isolated from the plant Desmodium tortuosum (Sw.) DC. The 1H and 13C NMR data acquired at room temperature exhibited doubling of signals, suggesting the presence of two rotamers in solution. Variable-temperature 1H NMR experiments confirmed this hypothesis. T-ROESY experiments in conjunction with theoretical (MM2) calculations supported the proposal that the two rotamers interchange via rotation about the C-6— C-1′′ bond. The spectral data were completely assigned using 1H– 1H COSY, HMQC, HSQC and HMBC experiments. Copyright © 2000 John Wiley & Sons, Ltd.
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