The amination of bromanil with 2,5-diaminobenzenesulphonic acid at 60-
degrees-C, unlike that of chloranil, leads to the total loss of haloge
n. Reaction at 0-degrees-C, however, results in the formation of ino-3
-sulphoanilino)-3,6-dibromo-1,4-benzoquinone. This dianilide, unlike t
he corresponding dichloro derivative, is readily reduced by warming it
in aqueous solution with an excess of 2,5-diaminobenzenesulphonic aci
d.