4-Chlorophenol → 9,10-Anthracenedione, 1-amino-2-(4-chlorophenoxy)-4-hydroxy-

Participants

Reaction Conditions

Reaction Steps

35 parts of potassium carbonate, 65 parts of p-chlorophenol, 4 parts of a 50% strength aqueous solution of diethanolamine dodecylbenzenesulfonate to act as a dispersant, 7 parts of a 50% strength aqueous solution of trimethylbenzylammonium chloride and 70 parts of 1-amino-2-chloro-4-hydroxyanthraquinone (95% pure) are introduced into 250 parts of water (resulting in a pH of 11), and the mixture is heated for 15 hours at 140° C., under a pressure of about 4.5 bar, whilst stirring. When it has cooled, the reaction mixture is poured into 350 parts of 10% strength sodium carbonate solution and the suspension is stirred for 1 hour at 70° C. and then filtered. The product is washed neutral and dried, giving 88 parts of 97% pure 1-amino-2-(4'-chlorophenoxy)-4-hydroxyanthraquinone, corresponding to a yield of 97% of theory.

Provenance & Evidence