7894. Protocatechuic Acid

Nomenclature

CAS number: 99-50-3
3,4-Dihydroxybenzoic acid.
C7H6O4; mol wt 154.12.
C 54.55%, H 3.92%, O 41.52%.

Description and references

Minute amounts are found in wheat grains, in wheat seedlings, and in many other plants: L. H"orhammer, A. Scherm, Arch. Pharm. 288, 441 (1955). Prepd by the alkaline fusion of vanillin: Tiemann, Haarmann, Ber. 7, 617 (1874); Pearl, J. Am. Chem. Soc. 68, 2180 (1946); Org. Synth. coll. vol. III, 745 (1955).

Chemical structure

Properties

White to brownish, cryst powder; discolors in air. d 1.54. mp ≈200° with decompn. Sol in 50 parts water; sol in alcohol, ether. Keep well closed.