Title:
PROCESSES FOR PRODUCING MALEAMIC ACID, ESTER THEREOF AND MALEIMIDE
Document Type and Number:
WIPO Patent Application WO/1995/009834
Kind Code:
A1
Abstract:
A process for producing an N-unsubstituted maleimide by imidating an N-unsubstituted maleamic ester through elimination of alcohol molecule and ring closure, wherein use is made of an acidic catalyst or mono(cyclo)alkyl sulfate and it is preferable to lower the alcohol concentration in the reaction mixture. When maleamic acid is reacted with an alcohol by using an inert solvent and an acidic catalyst, a mixture of maleamic with an acidic catalyst, or a mono(cyclo)alkyl sulfate, a corresponding maleamic ester is obtained. Maleamic acid is produced by the reaction of maleic anhydride with ammonia in an inert solvent, which reaction is conducted by feeding a solution of maleic anhydride in an inert solvent into a reactor and feeding ammonia gas into an open space of the reactor to cause the ammonia to be absorbed in the solution via the surface of contact of the solution with the gas.
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Inventors:
KUME YASUHIRO
KANEI HITOSHI
MORITA TAKEHIKO
KISHINO KAZUO
KITA YUICHI
KANEI HITOSHI
MORITA TAKEHIKO
KISHINO KAZUO
KITA YUICHI
Application Number:
PCT/JP1994/000749
Publication Date:
April 13, 1995
Filing Date:
May 09, 1994
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C07C231/02; C07C231/12; C07D207/448; C07D207/44; (IPC1-7): C07C233/09; C07C231/02; C07C231/12; C07D207/448
Foreign References:
| JPS50126659A | 1975-10-04 | |||
| JPH03184956A | 1991-08-12 | |||
| JPS4935325A | 1974-04-01 | |||
| JPH06128222A | 1994-05-10 | |||
| JPH06184105A | 1994-07-05 |
Other References:
See also references of EP 0672650A4
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