Armstrong's acid

Names

IUPAC name

Naphthalene-1,5-disulfonic acid

Other names

Armstrong's acid

Identifiers

CAS Number

81-04-9

3D model (Jmol)

Interactive image
Interactive image

ChEBI

CHEBI:30890

ChemSpider

6414^Y

ECHA InfoCard

InChI=1S/C10H8O6S2/c11-17(12,13)9-5-1-3-7-8(9)4-2-6-10(7)18(14,15)16/h1-6H,(H,11,12,13)(H,14,15,16)^Y
Key: XTEGVFVZDVNBPF-UHFFFAOYSA-N^Y
InChI=1/C10H8O6S2/c11-17(12,13)9-5-1-3-7-8(9)4-2-6-10(7)18(14,15)16/h1-6H,(H,11,12,13)(H,14,15,16)
Key: XTEGVFVZDVNBPF-UHFFFAOYAR

SMILES

O=S(C2=CC=CC1=C(S(=O)(O)=O)C=CC=C12)(O)=O
O=S(=O)(O)c1cccc2c1cccc2S(=O)(=O)O

Properties

Chemical formula

C₁₀H₈S₂O₆

Molar mass

288.299 g/mol

Appearance

colorless solid

Hazards

Main hazards

corrosive

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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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, which 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 2 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

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