455. 1-Amino-2-naphthol-6-sulfonic Acid

Nomenclature

CAS number: 5639-34-9
5-Amino-6-hydroxy-2-naphthalenesulfonic acid.
C10H9NO4S; mol wt 239.25.
C 50.20%, H 3.79%, N 5.85%, O 26.75%, S 13.40%.

Description and references

Prepd by reduction of sodium 1-nitroso-2-naphthol-6-sulfonate with zinc and acetic acid: Fierz-David et al., Helv. Chim. Acta 29, 1765 (1946).

Chemical structure

Properties

Needles or prisms. Slightly sol in boiling water, less sol in alc. Practically insol in ether.

Derivative

Sodium salt hemipentahydrate.

Nomenclature

Eikonogen.
C10H8NNaO4S.2H2O; mol wt 306.27.
C 39.22%, H 4.28%, N 4.57%, Na 7.51%, O 33.96%, S 10.47%.

Properties

Powder. Sol in water. Practically insol in alc, ether. Strong reducing action on silver salts.

Use

Free acid formerly used in manuf of azo dyes. Sodium salt used as photographic developer and for detection of potassium.