Chorismic acid: purification and some chemical and physical studies

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Abstract
Chorismic-acid, a new intermediate in aromatic biosynthesis, is the 3-enolpyruvic-ether of trans-3,4-dihydroxycyclohexa-l,5-diene-carboxylic-acid. Although chorismic-acid is a fairly labile compound, the Ba salt is readily isolated and examined. The ultraviolet-and infrared-absorption spectra of chorismate are given together with details of chromatography. Chorismate is readily converted by warming into a mixture of prephenate and 4-hydroxybenzoate. Under acid conditions, the prephenic-acid is further converted into phenylpyruvic-acid.