Dehydrohexahydroxydiphenic acid is a group found in dehydro
ellagitannins. It is formed from
hexahydroxydiphenic acid
Hexahydroxydiphenic acid is an organic compound with the formula HO)3C6HCO2Hsub>2. It is the oxidatively coupled derivative of gallic acid It is a white solid, although samples are typically brown owing to oxidation.
left, 142px, Ellagic acid. ...
(HHDP) through oxidation of the plant hydrolysable tannins.
[Correlation of oxidative transformations of hydrolyzable tannins and plant evolution. Takashi Yoshida and Tsutomu Hatano, Phytochemistry, November 2000, Volume 55, Issue 6, Pages 513–529, ] It is found in ellagitannins such as
euphorbin A,
geraniin
Geraniin is a dehydroellagitannin found in geraniums. It is found for instance in ''Geranium thunbergii'', which is one of the most popular folk medicines and also an official antidiarrheic drug in Japan. It can also be found in the rind of ''Neph ...
or
mallotusinic acid
Mallotusinic acid is a hydrolysable tannin found in the bark of '' Mallotus japonicus''. It is more generally present in Geraniales
Geraniales is a small order of flowering plants, included within the rosid subclade of eudicots. The largest fa ...
.
In
geraniin
Geraniin is a dehydroellagitannin found in geraniums. It is found for instance in ''Geranium thunbergii'', which is one of the most popular folk medicines and also an official antidiarrheic drug in Japan. It can also be found in the rind of ''Neph ...
, it is forming an equilibrium mixture of six-membered hemi-ketal and five-membered hemi-ketal forms.
References
Ellagitannins
Carboxylic acids
Heterocyclic compounds with 3 rings
Oxygen heterocycles
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