3318. Diphenylamine-2,2′-dicarboxylic Acid

Nomenclature

CAS number: 579-92-0
2,2′-Iminobis[benzoic acid].
C14H11NO4; mol wt 257.24.
C 65.37%, H 4.31%, N 5.44%, O 24.88%.

Description and references

Prepn from the alkali salts of anthranilic acid and of 2-chlorobenzoic acid in presence of copper: Ullmann, Ann. 355, 352 (1907).

Chemical structure

Properties

Yellow crystals from alcohol, mp 296-297° (dec). Insoluble in water. Very slightly sol in alcohol, ether, chloroform, glacial acetic acid.

Use

Instead of diphenylamine in reactions with oxidizing agents. May be used as an oxidation-reduction indicator in strongly acid solns.