Process for the manufacture of substituted maleimides

Details Process for the manufacture of substituted maleimides Process for the manufacture of substituted maleimides

1992-02-13

1994-04-26

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548549, 548522, 546175, C07D20744, C07D207452, C07D40104

Patent

active

053068289

ABSTRACT:
In a process for the preparation of substituted maleimides the corresponding amines are reacted with maleic anhydride and the thermal imidization of the resulting substituted amic-acids is effected in a mixed apolar/polar aprotic solvent medium in the presence of an acid catalyst, a substantial portion of the apolar solvent is subsequently selectively removed from the reaction mixture and most of the final product is precipitated.

REFERENCES:
patent: 2444536 (1948-07-01), Searle et al.
patent: 3496191 (1970-02-01), Cahoy et al.
patent: 3758498 (1973-09-01), Pfuller et al.
patent: 4780546 (1988-10-01), Kita et al.
Patent Abstracts of Japan 10(136) (C-347) (2193) May 20, 1986.
Patent Abstracts of Japan 10(287) (C-375) (2343) Sep. 30, 1986.
Patent Abstracts of Japan 11(75) (C-408) (2522) Mar. 6, 1987.
Patent Abstracts of Japan 9(254) (C-308) (1977) Oct. 11, 1985.

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