1,5-Dichloroanthraquinone → 9,10-Anthracenedione, 1,5-bis(phenylthio)-

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1,5-Dichloroanthraquinone (100 parts) is added at room temperature with stirring to a mixture of dimethylformamide (474 parts), thiophenol (135 parts) and potassium carbonate (63 parts). The suspension is heated at 125° C. for 3 hours, cooled to room temperature and then cooled to 5° C. for 1 hour. The precipitate is filtered off and washed with a 50/50 mixture of 95% ethanol and 8% sodium hydroxide solution (2×250 parts). The filter cake is then slurried with a further 500 parts of the ethanol/sodium hydroxide solution mixture. After stirring at room temperature for 1 hour, the precipitate is filtered off and washed again with ethanol/sodium hydroxide solution mixture (5×100 parts), followed by water (250 parts) containing glacial acetic acetic acid (25 parts) and finally water (3×250 parts). The filter-cake is dried at 70° C. giving 140.4 parts of 1,5-bis(phenylthio) anthraquinone, mp (melting point) 256° C.

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