2-Naphthol-6,8-disulfonic Acid
Title: 2-Naphthol-6,8-disulfonic Acid
CAS Registry Number: 118-32-1
CAS Name: 7-Hydroxy-1,3-naphthalenedisulfonic acid
Additional Names: 2-hydroxynaphthalene-6,8-disulfonic acid; G acid
Molecular Formula: C10H8O7S2
Molecular Weight: 304.30
Percent Composition: C 39.47%, H 2.65%, O 36.80%, S 21.07%
Literature References: Prepd by heating b-naphthol with concd H2SO4, 2-naphthol-3,6-disulfonic acid (R acid) being obtained as a byproduct: Fierz-David, Blangey, Fundamental Processes of Dye Chemistry (Interscience, New York, 1949) p 197; see also Forster, Keyworth, J. Soc. Chem. Ind. London 46, 27T (1927).
Derivative Type: Sodium salt
Additional Names: G salt
Properties: Platelets or prisms. Freely sol in water, sol in dil alcohol.
Derivative Type: Barium salt octahydrate
Molecular Formula: C10H6BaO7S2.8H2O
Molecular Weight: 583.73
Percent Composition: C 20.58%, H 3.80%, Ba 23.53%, O 41.11%, S 10.99%
Properties: Minute prisms. Freely sol in water. Practically insol in alcohol, even when much dil with water.
Use: In the manuf of azo dyes, see Crossley, Resenvelt, Ind. Eng. Chem. 16, 271 (1924).

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