Process for producing cyclic n-hydroxy imide compounds

Details Process for producing cyclic n-hydroxy imide compounds Process for producing cyclic n-hydroxy imide compounds

C - Chemistry, Metallurgy

07

D

C07D 207/46 (2006.01) C07D 209/48 (2006.01) C07D 211/94 (2006.01) C07D 223/10 (2006.01) C07D 487/04 (2006.01)

Patent

CA 2563269

A cyclic polycarboxylic anhydride, a polycarboxylic acid, or a mixture of these is reacted with hydroxylamine or a salt thereof in an organic solvent under dehydrating conditions to obtain the corresponding cyclic N-hydroxyimide compound. The cyclic polycarboxylic anhydride may be succinic anhydride, glutaric anhydride, etc. The polycarboxylic acid may be succinic acid, glutaric acid, adipic acid, etc. It is preferable in this method that an organic solvent capable of undergoing azeotropy with water be used as all or part of the reaction solvent and the reaction be conducted while the water present in the reaction system is kept being removed by azeotropy with the organic solvent. According to the method, a cyclic N-hydroxyimide compound can be produced in a satisfactory yield from either a cyclic polycarboxylic anhydride or a polycarboxylic acid.

Anhydride cyclique polycarboxylique, acide polycarboxylique, ou un mélange réagissant avec l'hydroxylamine ou un sel dans un solvant organique dans des conditions de déshydratation pour obtenir le composé cyclique N-hydroxyimide. L'anhydride cyclique polycarboxylique peut être un anhydride succinique, un anhydride glutarique, etc. L'acide polycarboxylique peut être l'acide succinique, l'acide glutarique, l'acide adipique, etc. Il est préférable dans ce procédé qu'un solvant organique est capable de subir un azéotrope á l'eau utilisée comme tout ou partie du solvant de réaction et la réaction à effectuer pendant que l'eau présente dans le système de réaction est conservée comme éliminée par azéotropie avec le solvant organique. Selon le procédé, un composé cyclique N-hydroxyimide peut être produit à un rendement satisfaisant d'un anhydride ou d'un acide polycarboxylique.

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