Anthraquinone-p-sulf onanilide.-This sulfonanilide was prepared essentially by the method of MacHoul.'An intimate mixture of 2 g. of Eastman Kodak Co. technical sodium anthraquinone-0-sulfonate and 5 g. of phosphorus pentachloride was heated under reflux in an oilbath at 150" for thirty minutes. The sulfonyl chloride formed was extracted with boiling toluene and the hot extract, after being filtered and cooled, was washed with several ...
