6391. 1-Naphthol-4-sulfonic Acid

Nomenclature

CAS number: 84-87-7
4-Hydroxy-1-naphthalenesulfonic acid; Nevile and Winther's acid.
C10H8O4S; mol wt 224.23.
C 53.56%, H 3.60%, O 28.54%, S 14.30%.

Description and references

Prepn from 1,4-diazonaphthalenesulfonic acid + sulfuric acid: Erdmann, Ann. 247, 341 (1888); by sulfonation of α-naphthylcarbonate: Reverdin, Ber. 27, 3458 (1894); from chlorosulfonic acid + α-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).

Chemical structure

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.