Synthesis of condensed tannins. Part 2. Synthesis by photolytic rearrangement, stereochemistry, and circular dichroism of the first 2,3-cis-3,4-cis-4-arylflavan-3-ols. - Van der Westhuizen,J.H.; Ferreira,D.; Roux,D.G. (J Chem Soc [Perkin I], 1981)