Abstract
The structure of the proanthocyanidin B-2 dimer was proved to be (—)epicatechin-(4β-8)-(—)epicatechin by two-dimensional heteronuclear NMR spectroscopy. The compound adopts two conformations in solution, in which the interflavan dihedral angles are roughly ±90°. The preferred conformation of the pyran ring is a half-chair with the 3′,4′-dihydroxyphenyl substituents in pseudo-equatorial positions. © 1997 John Wiley & Sons, Ltd.
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