6404. 1-Naphthylamine-5-sulfonic Acid

Nomenclature

CAS number: 84-89-9
5-Amino-1-naphthalenesulfonic acid; Laurent's acid.
C10H9NO3S; mol wt 223.25.
C 53.80%, H 4.06%, N 6.27%, O 21.50%, S 14.36%.

Description and references

Prepn from 5-chloro-1-naphthalenesulfonic acid + ammonia: Oehler, DE 72336 (1893); Frdl. 3, 435; from α-naphthylamine + concd sulfuric acid: Erdmann, Ann. 275, 193, 200 (1893); Sixma, Rec. Trav. Chim. 73, 235 (1954); from 2-naphthylamine-8-sulfonic acid: Blangey, Helv. Chim. Acta 39, 977 (1956).

Chemical structure

Properties

White crystals. Sol in 950 parts cold water; more sol in hot water.

Use

In dye chemistry.