Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1979-03-28
1980-10-21
Tovar, Jose
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
2603265FM, C07D207448, C07D207452
Patent
active
042293510
ABSTRACT:
In the production of maleimides of the general formula I ##STR1## in which n is one of the numbers 1, 2 or 3, R.sup.1 and R.sup.2 are each a hydrogen atom or methyl, and A is an n-valent aliphatic, cycloaliphatic, aliphatic-cycloaliphatic or aliphatic-aromatic radical having up to 30 C atoms, by means of cyclising dehydration of a maleamic acid of the formula II ##STR2## in which the acid amide group (s) is (are) attached to aliphatic or cycloaliphatic C atoms, in the presence of low-molecular dehydrating carboxylic anhydrides in an organic solvent and in the present of catalysts, there is advantageously used as solvent a polar aprotic solvent containing at least one N-lower-alkyl-substituted acid amide 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.degree. to 100.degree. C.
REFERENCES:
patent: 3018290 (1962-01-01), Sauers et al.
patent: 3839358 (1974-10-01), Bargain
patent: 4130564 (1978-12-01), Haug et al.
patent: 4138406 (1979-02-01), Balas Falvy
Haug Theobald
Kiefer Jurg
Ciba-Geigy Corporation
Hall Luther A. R.
Tovar Jose
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