PURPOSE: To simply obtain the title compound useful as a raw material for addition type polyamide raw material with a small amount of by-products by reacting a diamine compound with maleic anhydride as starting raw material in the presence of an acidic catalyst under reflux of an organic solvent by heating while removing formed water.
CONSTITUTION: A diamine compound shown by formula I (substitution position of amino group is 4- or 3-position based on ether bond) is reacted with maleic anhydride in the presence of an acidic catalyst (especially preferably p- toluenesulfonic acid) in an organic solvent such as hexane or N,N- dimethylformamide under reflux by heating preferably at 80-190°C, especially 100-160°C while removing formed water out of the system to give a compound shown by formula II (substitution position of maleimide group is 4- or 3-position based on ester bond). Maleic anhydride and the diamine component are preferably fed in a ratio of maleic anhydride/diamine component = 2.05-3.0 on the mol standard.
YAMAGUCHI KEISABURO
URAGAMI TATSUNOBU
YAMAGUCHI TERUHIRO
