Acetone → 1H-Pyrrole-2,5-dione, 1,1'-(4-methyl-1,3-phenylene)bis-

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A flask was equipped as in Example 1. To a solution of maleic anhydride (1.7 parts) in 3.9 parts acetone was added a solution of 1 part 4-methyl-m-phenylenediamine, 0.28 part triethylamine and 2.5 parts acetone. The heterogeneous reaction mixture was stirred at 40° C. for 30 minutes. Magnesium chloride hexahydrate (0.071 part) and 2.16 part acetic anhydride were added all at once. The reaction temperature was raised to 50° C. and maintained for 2.5 hours. Thirty minutes after the addition the mixture became homogeneous and remained so. The solution was cooled, and 16 parts water was added; the precipitated product was filtered by vacuum filtration, washed with water, and dried in a vacuum oven at 60° C. for 24 hours. N,N'-(4-Methyl-m-phenylene)dimaleimide, m.p. 168°-172° C., was obtained in 85% yield.

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