Abstract
AbstractTrigallic acid was isolated by Counter Current Distribution from a partial acid hydrolysate of Chinese tannic acid. Trigallic acid in polar solvents solution occurs in four isomeric forms. This is revealed by the four peaks obtained with reversed phase high performance liquid chromatography. Their ratio is function of the solvent. The four isomeric trigallic acid forms are in equilibrium. They result from the meta‐meta, meta‐para, para‐meta and para‐para coupling of the three gallic acid building blocks in trigallic acid. This was proved by spectroscopic and chemical methods.
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