1-Naphthol-4-sulfonic Acid
Title: 1-Naphthol-4-sulfonic Acid
CAS Registry Number: 84-87-7
CAS Name: 4-Hydroxy-1-naphthalenesulfonic acid
Additional Names: Nevile and Winther's acid
Molecular Formula: C10H8O4S
Molecular Weight: 224.23
Percent Composition: C 53.56%, H 3.60%, O 28.54%, S 14.30%
Literature References: Prepn from 1,4-diazonaphthalenesulfonic acid + sulfuric acid: Erdmann, Ann. 247, 341 (1888); by sulfonation of a-naphthylcarbonate: Reverdin, Ber. 27, 3458 (1894); from chlorosulfonic acid + a-naphthol: Gebauer-Fülnegg, Monatsh. Chem. 49, 195 (1928); Baddiley et al., US 1452481 (1923); from sodium naphthionate + SO2: Binns, Lurie, US 1880701 (1933 to Virginia Smelting).
Properties: Crystals, dec 170°. KOH 3´10-9. Very sol in water. Salt solns give a blue color with ferric chloride.
Use: Preparation of azo dyes.

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