When 0.9 g. of this substance was boiled and stirred for five hours with 125 ml. of acetic acid containing 14 g. of chromic anhydride and 5 ml. of epned. sulfuric acid, it gave 0.96 g. (96%) of crude dibasic acid, m. p. 400°with decomposition. The substance was insoluble in aqueous or alcoholic alkali and in all organic solvents except hot quinoline. Recrystallized from quinoline and then digested with boiling alcohol for thirty minutes, the pt.pupr quinquebenzone-£i,/>«-dicarboxylic add formed a colorless powder that sintered at 400°and melted at 405-410°with decomposition.
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