Phenoldisulfonic Acid
Title: Phenoldisulfonic Acid
CAS Registry Number: 96-77-5
CAS Name: 4-Hydroxy-1,3-benzenedisulfonic acid
Additional Names: 4-hydroxy-m-benzenedisulfonic acid; 1-phenol-2,4-disulfonic acid
Molecular Formula: C6H6O7S2
Molecular Weight: 254.24
Percent Composition: C 28.34%, H 2.38%, O 44.05%, S 25.22%
Literature References: Conveniently prepd by hydrolysis of the dichloride which is obtained by the action of chlorosulfonic acid on phenol at room temp: Pollak et al., Monatsh. Chem. 46, 395 (1925). Monograph: E. E. Gilbert, Sulfonation and Related Reactions (Interscience, New York, 1965) 529 pp.
Properties: Deliquescent needles, vague melting range from 89° to 100°. Decomp above 100°. Freely sol in water, methanol. Practically insol in ether, petr ether.
Use: In the manuf of aminophenoldisulfonic acids which are intermediates in the dye industry.

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