Preparation process of n-substituted maleimides

Details Preparation process of n-substituted maleimides Preparation process of n-substituted maleimides

C - Chemistry, Metallurgy

07

D

260/306, 202/59,

C07D 207/448 (2006.01) B01D 3/36 (2006.01) C07D 207/452 (2006.01)

Patent

CA 2004654

Abstract of the Invention A process for the preparation of N-substituted maleimides by conducting heat-dehydration and dehydrating imidization of N-substituted maleamic acids under azeotropic distillation of generated water in a solvent mixture containing a solvent capable of forming water azeotrope and an organic aprotic polar solvent, in the presence as catalyst of a zinc salt of a maleamic acid, metallic zinc or a zinc compound which forms a zinc salt of the N-substituted maleamic acid in the reaction system. - 4 8 -

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