6400. 1-Naphthylamine-2,7-disulfonic Acid

Nomenclature

CAS number: 486-54-4
1-Amino-2,7-naphthalenedisulfonic acid; Kalle's acid.
C10H9NO6S2; mol wt 303.31.
C 39.60%, H 2.99%, N 4.62%, O 31.65%, S 21.14%.

Description and references

Prepn from 1-naphthylamine-2,4,7-trisulfonic acid: DE 62634 (1892 to Kalle); Frdl. 3, 431; from 1-naphthylamine-2,5,7-trisulfonic acid: DE 255724 (1912 to Bayer); Frdl. 11, 217.

Chemical structure

Properties

Needles.

Derivative

Sodium salt.

Properties

Prisms from dil alc. Solns display a blue-green fluorescence.

Derivative

Barium salt.

Properties

Needles. Very slightly sol in hot water.