Armstrong's acid
Names | |
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IUPAC name
Naphthalene-1,5-disulfonic acid | |
Other names
Armstrong's acid | |
Identifiers | |
81-04-9 | |
ChEBI | CHEBI:30890 |
ChemSpider | 6414 |
| |
Jmol-3D images | Image Image |
PubChem | 6666 |
| |
Properties | |
C10H8S2O6 | |
Molar mass | 288.299 g/mol |
Appearance | colorless solid |
Hazards | |
Main hazards | corrosive |
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | |
verify (what is: / ?) | |
Infobox references | |
Armstrong's acid (naphthalene-1,5-disulfonic acid) is an organic compound with the formula C10H6(SO3H)2. It is one of several isomers of naphthalenedisulfonic acid. It a colorless solid, typically obtained as the tetrahydrate.[1] Like other sulfonic acids, it is a strong acid. It is named for British chemist Henry Edward Armstrong.[2]
Production and use
It is prepared by disulfonation of naphthalene with oleum:
- C10H8 + 2 SO3 → C10H6(SO3H)2
Further sulfonation gives The 1,3,5-trisulfonic acid derivative.[1]
Reactions and uses
Fusion of Armstrong's acid in NaOH gives the disodium salt of 1,5-dihydroxynaphthalene, whch can be acidified to give the diol. The intermediate in this hydrolysis, 1-hydroxynaphthalene-5-sulfonic acid, is also useful. Nitration gives nitrodisulfonic acids, which are precursors to amino derivatives.
The disodium salt is sometimes used as a divalent counterion for forming salts of basic drug compounds, as an alternative to the related mesylate or tosylate salts. When used in this way such a salt is called a naphthalenedisulfonate salt, as seen with the most common salt form of the stimulant drug CFT. The disodium salt is also used as an electrolyte in certain kinds of chromatography.[3]
References
- ↑ 1.0 1.1 Gerald Booth "Naphthalene Derivatives" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a17_009.
- ↑ Senning, Alexander (2007). Elsevier's dictionary of chemoetymology. Elsevier. p. 30. ISBN 978-0-444-52239-9.
- ↑ Shigeru Terabe "Electrokinetic chromatography: An interface between electrophoresis and chromatography" TrAC Trends in Analytical Chemistry 1989, Volume 8, pp. 129–134. doi:10.1016/0165-9936(89)85022-8