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Abstract

The invention relates to a process for the preparation of N-substituted acrylamides of the general formula ##STR1## wherein Y denotes a bivalent straight - or branched chain radical with 2 to 30, preferably 2 to 18, and particularly 2 to 6 carbon atom-, preferably a group of the formula (Y.sub.1).sub.m -(Y.sub.2).sub.n -(Y.sub.3).sub.t, in which Y.sub.1, Y.sub.2 and Y.sub.3 each stands for an alkylene group or the radical of a cyclic organic ring system with 5 or 6 carbon atoms, and the sum of m, n, and t is 2 or 3, and R.sub.1 denotes hydrogen or the radical of an amine of the formula N(R.sub.2) (R.sub.3), wherein R.sub.2 and R.sub.3 stand for alkyl radicals with 1 to 4 carbon atoms, which method is characterized in that dihydracrylic acid amide of the general formula ##STR2## is transmitted with amines of the general formula H.sub.2 N--(Y)--R.sub.1 (III) with elimination of ammonia and the resulting N-substituted .beta.-carboxylic acid amides are converted into the desired N-substituted acrylamides at elevated temperatures by splitting out of water. The conversion of the N-substituted acrylamides with splitting out of water is preferably effected in the presence of a catalyst. The splitting out of water is preferably carried out at a temperature of 100.degree. to 200.degree. C. The second stage (splitting out of water) follows batch-wise at 70.degree. to 200.degree. C. or continuously at 250.degree. to 450.degree. C.

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First Claim