Tetroquinone
Structural Formula Vector Image
Title: Tetroquinone
CAS Registry Number: 319-89-1
CAS Name: 2,3,5,6-Tetrahydroxy-2,5-cyclohexadiene-1,4-dione
Additional Names: tetrahydroxy-p-benzoquinone; tetrahydroxyquinone; THQ
Manufacturers' Codes: HPEK-1; NSC-112931
Molecular Formula: C6H4O6
Molecular Weight: 172.09
Percent Composition: C 41.88%, H 2.34%, O 55.78%
Literature References: Prepn from glyoxal: A. J. Fatiadi, W. F. Sager, Org. Synth. coll. vol. V, 1011 (1973). Clinical evaluation for ophthalmic fibrosis: R. Ching, Eye Ear Nose Throat Mon. 50, 101, 144 (1971).
Properties: Dark, odorless, tasteless crystals with blue-black metallic luster in reflected light. mp 280°. Sol (1:200) in cold water; sol (1:100) in hot water or in alcohol; slightly sol in ether. It acts like a strong dibasic acid.
Melting point: mp 280°
 
Derivative Type: Disodium salt
Molecular Formula: Na2C6H2O6
Molecular Weight: 216.06
Percent Composition: Na 21.28%, C 33.35%, H 0.93%, O 44.43%
Properties: Almost black crystals with a green metallic luster, sparingly sol in water.
 
Use: Disodium salt is used as an indicator in the volumetric determination of sulfate by means of barium chloride solution.

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