1-Chloroanthraquinone → 9,10-Anthracenedione, 1-(phenylthio)-

Participants

Reaction Conditions

Reaction Steps

45 g Thiophenol are added dropwise to a suspension of 100 g 1-chloro-anthraquinone and 63 g potassium carbonate in 150 ml ethoxyethanol at 23° C. under stirring. The reaction is strongly exotherm and addition must be performed very slowly, and subsequent addition of solvent improves fluidity and stirring of the reaction mixture. After heating at 120° C. for 3½ hours and subsequent cooling to 23° C., the mixture is filtered on glass (porosity 3) to afford a presscake which is washed with 1 l of methanol. The presscake is in turn suspended in 1 l water at 50° C. and again filtered on a glass filter (porosity 3). Further washing of the presscake with warm water (4 l) affords a filtrate of neutral pH. The presscake is finally dried at 60° C./5·103 Pa for 12 hours to provide 124.1 g of powdery orange 1-phenylsulfanyl-anthraquinone of formula

Provenance & Evidence