Process for the preparation of N-substituted cyclic imides

Details Process for the preparation of N-substituted cyclic imides Process for the preparation of N-substituted cyclic imides

1996-02-06

1998-06-30

Haley, Jacqueline

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548407, 548548, 548549, C07D20736

Patent

active

057736308

ABSTRACT:
N-Substituted cyclic imides are obtained by reacting a cyclic acid anhydride with an amine in the presence of a solvent and an acid catalyst at 80.degree. to 200.degree. C. and with removal of the water formed, it being particularly advantageous to carry out this reaction in the presence of a stabilizer and an inert, dipolar aprotic cosolvent, optionally to add an inert organic solvent of low or zero polarity to the reaction mixture present after the reaction, to add a non-aqueous base in an amount of 0.5 to 50% by weight, based on the cyclic anhydride of the formula (II) used, and to separate off the precipitate formed to give a filtrate containing the N-substituted cyclic imide.

REFERENCES:
patent: 3890270 (1975-06-01), Minieri
patent: 4904803 (1990-02-01), Fujita et al.
patent: 5136052 (1992-08-01), Van Gysel et al.
Patent Abstracts of Japan, vol. 17, No. 361, abstract of JP 05-051,362, (1993).
Chemical Abstracts, vol. 75, abstract No. 118127y, abstract of DE 2,100,800, (1971).

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