6645. 2-Nitro-4-sulfobenzoic Acid

Nomenclature

CAS number: 552-23-8
C7H5NO7S; mol wt 247.18.
C 34.01%, H 2.04%, N 5.67%, O 45.31%, S 12.97%.

Description and references

Prepn by sulfonation of o-nitrotoluene and oxidation of the resulting 2-nitro-4-toluenesulfonic acid with potassium permanganate: Hart, Am. Chem. J. 1, 352 (1879-80).

Chemical structure

Properties

Needles from hydrochloric acid. Stable in air under ordinary conditions.

Use

Alkalimetric standard.