Process for the preparation of pure, aromatic o-hydroxy-carboxyl

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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260560, C07C10204

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active

039475158

ABSTRACT:
Process for the preparation of pure aromatic o-hydroxy-carboxylic acid aryl amides by condensing an aromatic o-hydroxy-carboxylic acid with an aryl amine in the presence of phosphorus chlorides in an organic solvent or diluent, which process comprises treating the reaction mixture or the reaction product with 1 to 25 %, calculated on the weight of the reaction product, of an aliphatic amino-polycarboxylic acid as chelate forming agent. It is not necessary to purify the products, because they are obtained in such a pure form that they can be used directly as coupling components for azo pigments.

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patent: 2410397 (1946-10-01), Weiss et al.
patent: 2636900 (1953-04-01), Rambacher et al.
patent: 2691041 (1954-10-01), Clinton et al.
patent: 2763683 (1956-09-01), Beman et al.

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