satisfactorily by recrystallization. Purification of this product by chromatography on silicic acid usually resulted in the separation of a considerable amount of unreacted ketone and a low yield of the pure reagent. In the present work bromination of the ketone in the presence of a small amount of anhydrous aluminum chloride catalyst resulted in the formation of essentially no tars and gave crude p-phenylazophenacvl bro-mide in excellent yields, usually 85 to 90%, which was easily purified by recrystallization or by chromatographic techniques.
LITERATURE CITED(1) Blatt, A. H., "Organic Syntheses,"
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