| abstract |
Procedure for the preparation of pigments of nitro dyes, of the formula ** (See formula) ** characterized, by condensing, in the molar ratio 2: 1, the halide of a carboxylic acid of the formula ** (See formula) ** with an aromatic diamine, meaning in the indicated formulas, R an aromatic radical and the benzene radicals B can still show other substituents not soluble in water. (Machine-translation by Google Translate, not legally binding) |