133145-19-4Relevant academic research and scientific papers
Tannins and related compounds. CXVIII. Structures, preparation, high-performance liquid chromatography and some reactions of dehydroellagitannin-acetone condensates
Tanaka,Fujisaki,Nonaka,Nishioka
, p. 2937 - 2944 (1992)
The dehydroellagitannins having a dehydrohexahydroxydiphenoyl ester group in the molecule were found to undergo highly regio- and stereospecific condensation with acetone in the presence of ammonium ion under almost neutral conditions. This reaction was s
Tannins and related polyphenols of euphorbiaceous plants. IX. Hydrolyzable tannins with 1C4 glucose core from Phyllanthus flexuosus Muell. Arg.
Yoshida,Itoh,Matsunaga,Tanaka,Okuda
, p. 53 - 60 (2007/10/02)
Four new hydrolyzable tannins (phyllanthusiins A-D), a new polyphenol of related structure (phyllanthusiin E), and eight known polyphenols have been isolated from the leaves of Phyllanthus flexuosus. On the basis of the spectroscopic methods including 1H-13C long-range two-dimensional nuclear magnetic resonance techniques, phyllanthusiins A (9), B (12) and C (14), were characterized as oxidative metabolites of geraniin, each having a different new acyl group biogenetically formed via an oxidative cleavage of the dehydrohexahydroxydiphenoyl group, on the 1C4 glucopyranose core. Phyllanthusiin D (15) was determined to be a condensate of geraniin with acetone, and phyllanthusiin E (16), was an oxidized congener of ellagic acid.
