
%0 Journal Article
%A Clark-Lewis, JW 
%T Flavan derivatives. XXI. Nuclear magnetic resonance spectra, configuration, and conformation of flavan derivatives
%J Australian Journal of Chemistry
%D 1968/08/01
%V 21
%N 8
%P 2059-2075
%K 
%R https://doi.org/10.1071/CH9682059
%U https://www.publish.csiro.au/paper/CH9682059 
%X Nuclear magnetic resonance spectra of 80 compounds belonging to several classes of flavan derivative have been analysed, and chemical shifts and coupling constants of heterocyclic ring protons and aromatic protons are tabulated and discussed. Compounds examined include flav-2-enes, flav-3-enes, 3-substituted flavanones and flavans, 2- and 4-substituted isoflavans, 3,4-disubstituted flavans, and flavan-4-ols. The geometrical configurations of substituents in the heterocyclic ring follow unequivocally from the magnitudes of the vicinal coupling constants. 
