Document Detail


CONFIGURATION OF GUIBOURTACACIDIN, AND SYNTHESIS OF ISOMERIC RACEMATES.
MedLine Citation:
PMID:  14343148     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. Diacetates of the four possible racemates of 4',7-dimethoxyflavan-3,4-diol have been synthesized. 2. Comparison of their nuclear-magnetic-resonance spectra and the ionophoretic mobilities of the diols in borate buffer with those of the corresponding derivatives of guibourtacacidin shows that the natural 4',7-dihydroxyflavan-3,4-diol has a 2,3-cis-3,4-trans configuration, but is accompanied by 2,3-trans-3,4-trans and 2,3-trans-3,4-cis isomers. These occur in the approximate proportions 5:1:1. 3. The occurrence of guibourtacacidins in Guibourtia coleosperma appears to be of taxonomic significance. Their association with a large excess of related tannins in the heartwood suggests that flavan-3,4-diols with these configurations are suitable precursors in tannin biosynthesis.
Authors:
H M SAAYMAN; D G ROUX
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Biochemical journal     Volume:  96     ISSN:  0264-6021     ISO Abbreviation:  Biochem. J.     Publication Date:  1965 Jul 
Date Detail:
Created Date:  1965-12-01     Completed Date:  1996-12-01     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  2984726R     Medline TA:  Biochem J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  36-42     Citation Subset:  OM    
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MeSH Terms
Descriptor/Qualifier:
Biochemical Phenomena
Biochemistry*
Chromatography*
Magnetic Resonance Spectroscopy*
Plants*
Pyrans*
Research*
Tannins*
Chemical
Reg. No./Substance:
0/Pyrans; 0/Tannins
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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