Abstract
The13C NMR of a number of 3- and 5-hydroxyflavones and of 3- and 5-methoxyflavones have been studied for the first time and all the signals have been assigned. A comparison of the chemical shifts of the13C nuclei with the acidity and basicity parameters of the compounds investigated and with the results of calculations of π-charge density has been made. It has been shown that the chemical shifts of the individual signals in the13C NMR spectra are qualitatively connected with estimates of the reactivities of the compounds studied.
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