Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-02-04
1976-03-30
Curtis, Allen B.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260560, C07C10204
Patent
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: 2763683 (1956-09-01), Beman et al.
Galster Hans
Miedtank Sighart
Ruffer Adam
Curtis Allen B.
Hoechst Aktiengesellschaft
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