1-amino-4-(4',5'-dilower alkyl-3-sulphamoylphenylamino)anthraquinone-2-sulfonic acids
Abstract
Abstract A PROCESS FOR PRODUCING 1-AMINO-4-(4'',5''-DI-LOWER ALKYL-3-SULPHAMOYL-PHENYL)-AMINO ANTHRAQUINONES IS DESCRIBED WHICH AFFORDS VERY HIGH YIELDS OF THESE NOVEL DYESTUFFS FREE FROM BY-PRODUCTS AND INVOLVES THE REACTION OF A 1-AMINO-4 - HALOGENO-ANTHRAQUINONE WITH A 1 - AMINO-4,5DIALKYL-3-SULPHAMOYL-BENZENE. THE NOVEL ANTHRAQUINONES WHICH PREFERABLY BEAR A SULPHONIC ACID GROUP IN 2-POSITION AT THE ANTHRAQUINONE NUCLEUS ARE PRACTICALLY FREE FROM ISOMERS HAVING A SULPHAMOYL GROUP IN 2- OR 6-POSITION AT THE 4,5-DIALKYLPHENYLAMINO MOIETY, AND DYE NATURAL AND SYNTHETIC POLYAMIDE FIBERS IN LEVEL VIVID, PURE BLUE SHADES OF GOOD FASTNESS PROPERTIES, ESPECIALLY FASTNESS TO LIGHT; THE BRILLIANCE OF THE SHADE DOES NOT SUFFER EVEN WHEN OBSERVED UNDER ARTIFICIAL LIGHT.
Inventors
- 👤 P Hindermann
- 👤 H Meindl
Bibliographic Details
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