¹³C NMR spectra of a series of 2′,3′,4′‐trimethoxyflavones. Reinvestigation of signal assignment in ¹³C NMR spectra of flavones

Abstract

13C NMR chemical shifts of a series of 2′,3′,4′‐trimethoxylated flavones are reported. The 13C NMR chemical shifts of 2′,3′, 4′‐trimethoxyflavone was reinvestigated by 2D NMR. It is shown that two signals which were assigned by the lanthanide shift reagent method in an earlier study must be reversed.