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  • Title: CONDENSED TANNINS. OPTICALLY ACTIVE DIASTEREOISOMERS OF (+)-MOLLISACACIDIN BY EPIMERIZATION.
    Author: DREWES SE, ROUX DG.
    Journal: Biochem J; 1965 Feb; 94(2):482-7. PubMed ID: 14348209.
    Abstract:
    1. (+)-Mollisacacidin [(+)-3',4',7-trihydroxy-2,3-trans-flavan-3,4-trans- diol] is converted by autoclaving into the optically active free phenolic 2,3-trans-3-4-cis (12% yield), 2,3-cis-3,4-trans (11%) and 2,3-cis-3,4-cis (2.8%) diastereoisomers through epimerization at C-2 and C-4. 2. The relative configurations of the epimeric forms were determined by nuclear-magnetic-resonance spectrometry and paper ionophoresis in comparison with synthetic reference compounds, and was confirmed by chemical interconversions. 3. From this a scheme of epimerization is inferred and their absolute configurations are assigned as (2R:3S:4S), (2S:3S:4R) and (2S:3S:4S) respectively from the known absolute configuration (2R:3S:4R) of (+)-mollisacacidin.
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