摘要:
Production of 1-amino-4-hydroxyanthraquinones, which can be substituted in the 2- and 3-positions by carboxylic acid, carboxylic ester or alkyl groups or chlorine or bromine, by heating 3''-nitrobenzoyl-benzoic acids, which can be substituted in the 4''- and 5''-positions, in sulfuric acid or oleum in the presence of boric acid, boric acid esters, boron trihalides or their complex compounds to temperatures between about 120* and 200*C. The reaction products are dyes or intermediates for valuable disperse dyes.