Preparation process of N-substituted maleimides

Details Preparation process of N-substituted maleimides Preparation process of N-substituted maleimides

1989-12-08

1992-12-29

Springer, David B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548545, 548521, 548549, C07D207452, C07D207444, C07D40306

Patent

active

051753090

ABSTRACT:
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.

REFERENCES:
patent: 4786738 (1988-11-01), Kita et al.
Cava et al., N-phenylmaleimide, Organic Synthesis, vol. 41, pp. 93-95.
CA 105(12):98099y.

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