IN WHICH TWO OF THE GROUPS X are hydroxyl and the third X is unsubstituted or substituted alkylamino, unsubstituted or substituted phenylamino, phenylthio, aliphatic, cycloaliphatic or aromatic acylamino or N''-alkylureido for dyeing synthetic material. Dyeings obtained therewith have good fastness properties. The invention relates to new dyes based on anthrapyrimidines for synthetic fibers.
Abstract:
Production of amides of 1-aminoanthraquinone-2-carboxylic acid which bear hydrogen, cyclohexylamino, chloro, bromo or nitro as substituent in the 4-position by reaction of 1,2-dihydro-7,8diphthaloyl-3,1,4H-benzoxazone-4:
IN WHICH R2 is H, Cl, Br, NH-cyclohexyl or NO2, with an aliphatic or cycloaliphatic amine of one to eight carbon atoms in the molar ratio 1:1. Some of the amides are disperse dyes but particularly they are intermediates for the production of disperse dyes.
in which ONE X is OH and the other X is NH2; and R is hydrogen, cycloalkyl, phenyl or alkyl which may bear hydroxyl or alkoxy as a substitutent. It dyes linear polyesters deep bluish green hues of outstanding fastness properties.
Abstract:
The production of 1-amino-4-nitroanthraquinone-2-carboxylic esters by reaction of 1,2-dihydro-6-nitro-7,8-diphthaloyl-3,1,4Hbenzoxazone-4 with an alcohol in the presence of an acid catalyst. Pure carboxylic esters are immediately obtained in a high yield previous isolation of the carboxylic acid.
Abstract:
An improvement in the process for the production of 1-amino-4nitroanthraquinone-2-carboxylic acid from 1-aminoanthraquinone-2carboxylic acid by reaction with formaldehyde in concentrated sulfuric acid and nitration of the reaction product into 1,2dihydro-6-nitro-7,8-diphthaloyl-3,1,4H-benzoxazone-4 followed by hydrolysis of the same. The improvement consists in precipitating the benzoxazone derivative by adding a precipitant, hydrolyzing the isolated benzoxazone derivative in aqueous solution and precipitating the 1-amino-4-nitro-anthraquinone-2-carboxylic acid from the alkaline solution by acidification. 1-amino-4nitroanthraquinone-2-carboxylic acid is obtained in a purity of 95 percent by weight or more.