| Identification | More | [Name]
Naphthalene-2,7-disulfonic acid | [CAS]
92-41-1 | [Synonyms]
2,7-NAPHTHALENE DISULFONIC ACID
naphthalene-2,7-disulfonic acid
naphthalene-2,7-disulphonic acid
3,6-Naphthalenedisulfonic acid
Ebert-Merz α-acid | [EINECS(EC#)]
202-154-6 | [Molecular Formula]
C10H8O6S2 | [MDL Number]
MFCD00035734 | [Molecular Weight]
288.3 | [MOL File]
92-41-1.mol |
| Hazard Information | Back Directory | [Chemical Properties]
White, crystalline solid.Soluble in
water. Combustible. | [Definition]
ChEBI: A naphthalenesulfonic acid in which the sulfo groups are attached to positions 2 and 7 of the naphthalene ring. | [Production Methods]
The 2,7-disulfonic acid is always the main product of high-temperature sulfonation of naphthalene, but at 160 C it converts slowly to an equilibrium mixture containing ca. 30 % of the 2,6-isomer. Crystallization of the pure product from conventional sulfonation is difficult, and alternative processes, (for example, reaction of naphthalene vapor with sulfur trioxide in the gas phase at 220 C) are said to give a purer product. | [Purification Methods]
Crystallise the acid from conc HCl. The disulfonamide has m 273o (from EtOH). [Beilstein 11 II 119, 11 III 463.] |
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