6406. 2-Naphthylamine-1-sulfonic Acid

Nomenclature

CAS number: 81-16-3
2-Amino-1-naphthalenesulfonic acid; Tobias acid.
C10H9NO3S; mol wt 223.25.
C 53.80%, H 4.06%, N 6.27%, O 21.50%, S 14.36%.

Description and references

Prepd by sulfonation of 2-naphthylamine: Tinker, Hansen, US 1969189 (1934 to du Pont). Utilization in viral biology study: N. Sakota et al., J. Ferment. Technol. 56, 53 (1978). TLC study: J. Franc, V. Koudelkova, J. Chromatogr. 170, 89 (1979).

Chemical structure

Properties

Anhydr scales from hot water; hydrated needles from cold water. Slightly sol in cold water; more sol in hot water; very slightly sol in alcohol, ether.

Derivative

Diethylammonium salt.
C10H9NO3S.(C2H5)2NH; mol wt 296.39.
C 56.73%, H 6.80%, N 9.45%, O 16.19%, S 10.82%.

Properties

mp 180°.

Use

Dyestuff intermediate.