Acetic Anhydride → N,N'-1,3-Phenylenedimaleimide

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A flask was equipped as in Example 1. To a solution of maleic anhydride (1.92 parts) and 13 parts ethyl acetate was added a mixture of 1 part m-phenylenediamine, 0.32 part triethylamine and 2.3 parts ethyl acetate over a 40-minute period. The resulting heterogeneous mixture was maintained at 40° C. for 50 minutes. Magnesium chloride hexahydrate (0.08 part) and 2.44 parts acetic anhydride were added all at once. The temperature was raised to 50° C. and maintained for 3 hours. The precipitated product was isolated by vacuum filtration, the filter cake washed with water, and dried. A 70% yield of N,N'-m-phenylenedimaleimide, m.p. 202°-203° C., was obtained.

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