| abstract |
The present invention is concerned with the use of aniline derivatives of the general formula: <IMAGE> (I) wherein R1 is a hydrogen atom or a -(CH2)n-X radical, in which n is a whole number of from 1 to 3, X is H, OH, NH2, CH3CONH, CH3SO2NH, COOH, SO3H or -ArSO3H, Ar being an optionally substituted arylene radical, m is a whole number of from 2 to 4, R3 is a hydrogen atom, an alkyl radical containing up to 3 carbon atoms, OCH3, CH3CONH, COOH or SO3H and R4 is a hydrogen, chlorine or bromine atom or a carboxylic acid or sulphonic acid group, as coupling components in oxidative color formation reactions. The present invention also provides an agent for the analytical determination of oxidizing substances by oxidative color coupling which, as coupling component, contains at least one compound of general formula (I). |