Process for producing aliphatically n-substituted maleimides

Details Process for producing aliphatically n-substituted maleimides Process for producing aliphatically n-substituted maleimides

C - Chemistry, Metallurgy

07

D

260/306.3, 260/3

C07D 207/448 (2006.01) C07D 207/452 (2006.01)

Patent

CA 1124730

ABSTRACT OF THE DISCLOSURE In the production of maleimides of the general formula I Image ( I ) in which n is one of the numbers 1, 2 or 3, Rl and R2 are each a hydrogen atom or methyl, ant A is an n-valent aliphatic, cycloaliphatic, aliphatic-cycloaliphatic or aliphatic-aromstic radical having up to 30 C atoms, by means of cyclising dehydration of a maleamic acid of the formula II Image (II) in which the acid amide group(s) is (are) attached to aliphatic or cyoloaliphatic C atoms, in the presence of low-molecular dehydratingcarboxylic anhydrides in an organic solvent and in the present of catalysts, there 18 advantageously used as solvent a polar aprotic solvent containing at least one N-lower-alkyl-substituted acid amids group in the molecule, or a solvent mixture containing an aprotic solvent of this type, and as catalyst a metal compound, and the cyclising dehydration is performed in the temperature range of 40 to 100°C.

324867

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