STRUCTURAL ELUCIDATION OF POLYMETHOXYFLAVONES FROM SHIFT REAGENT PROTON NMR MEASUREMENTS

Article abstract of DOI:10.1016/0031-9422(81)85114-X

Key Word Index - Polymethoxyflavones; 1H NMR; shift reagents; Pr(fod)3; structural elucidation. The quantitative shift reagent behavior of polymethoxylated flavones in the presence of Pr(fod)3 shows that for structural elucidation of these molecules the degree of substitution on the neighbourhood of the carbonyl group can be determined from the number of signals that are strongly shifted and broadened.The induced shifts of the remaining signals are of complementary help and even the resonances of individual methoxy groups can be ascribed.