Sulfuric Acid → 1-Aminoanthraquinone

Participants

Reaction Conditions

Reaction Steps

50 Parts of 1-hydroxylaminoanthraquinone was stirred into a mixture of 1,000 parts of ethyleneglycol monomethyl ether and 30 parts of conc. sulfuric acid. After heated to 75°C, the mixture was added with 17 parts of iron dust little by little over 1 hour and maintained at 75°C for additional 3 hours. The reaction mixture was then filtered while hot and the residue was washed with 100 parts of ethyleneglycol monomethyl ether heated at 80°C. Thus, unreacted metallic iron and iron sulfate were separated as residue. The filtrate was added with 200 parts of water and then cooled to 25°C to precipitate crystals. The crystals were recovered by filtration, washed with water and dried to obtain 43.5 parts of 1-aminoanthraquinone of a purity of 95 %.

Provenance & Evidence