Circular dichroism spectra of 26 procyanidins and their derivatives have been measured. All exhibit a strong positive or negative couplet at 200–220 nm and this has been correlated with the absolute stereochemistry at C-4 on the interflavan linkage.
M. W. Barrett, W. Klyne, P. M. Scopes, A. C. Fletcher, L. J. Porter and E. Haslam, J. Chem. Soc., Perkin Trans. 1, 1979, 2375 DOI: 10.1039/P19790002375
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