Diphenylamine-2,2'-dicarboxylic Acid
Title: Diphenylamine-2,2¢-dicarboxylic Acid
CAS Registry Number: 579-92-0
CAS Name: 2,2¢-Iminobis[benzoic acid]
Molecular Formula: C14H11NO4
Molecular Weight: 257.24
Percent Composition: C 65.37%, H 4.31%, N 5.44%, O 24.88%
Literature References: Prepn from the alkali salts of anthranilic acid and of 2-chlorobenzoic acid in presence of copper: Ullmann, Ann. 355, 352 (1907).
Properties: Yellow crystals from alcohol, mp 296-297° (dec). Insoluble in water. Very slightly sol in alcohol, ether, chloroform, glacial acetic acid.
Melting point: mp 296-297° (dec)
Use: Instead of diphenylamine in reactions with oxidizing agents. May be used as an oxidation-reduction indicator in strongly acid solns.

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