Two-, three- and four-bond spin–spin coupling between 13C and hydrogen-bonded hydroxy-protons, identified by deuterium exchange, is shown to aid the assignment of 13C n.m.r. spectra in a series of 5-hydroxyflavones and flavonones.
F. W. Wehrli, J. Chem. Soc., Chem. Commun., 1975, 663 DOI: 10.1039/C39750000663
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