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A typical example of this process is the formation of N,N'-m-phenylenedimaleimide. This involves the addition of maleic anhydride to a solution of m-phenylenediamine in dimethylformamide (DMF) and reacting these at a temperature of 35°-40° C. to form N,N'-m-phenylenedimaleamic acid, which is not isolated. The addition of sodium acetate and acetic anhydride follows, with a maximum reaction temperature for ring closure of 55°-60° C. On the completion of this reaction, a large excess of water is added, precipitating the N,N'-m-phenylenedimaleimide which is subsequently filtered, washed with water, and dried at a moderately elevated temperature. This process is outlined below: ##STR1## N,N'-m-phenylenedimaleimide

1. customat a temperature of 35°-40° C.