| 摘要 |
alpha -Pyrrolidones and cyclic amidines Ia and Ib, respectively, for washing gases. <IMAGE> (Ia) <IMAGE> (Ib) where R1 and R2 are each C1-C8-alkyl, C1-C8-alkoxy, C3-C10-cycloalkyl or C3-C10-cycloalkoxy or are bonded to one another to form a ring, R3 is hydrogen, C1-C6-alkyl, phenyl or naphthyl and R4 and R5 are each hydrogen or C1-C4-alkyl, are prepared by a method in which an amine II <IMAGE> (II) where R3' is hydrogen, tert-butyl, phenyl or naphthyl, is reacted with an alpha , beta -unsaturated carboxylic acid derivative III <IMAGE> (III) where X is OR', -NR'R'', -NHR' or -NH2 and R' and R'' are each C1-C8-alkyl, C3-C8-cycloalkyl or phenyl, or with an alpha , beta -unsaturated nitrile IV <IMAGE> (IV) in the presence of a free radical initiator, and, where R3' is hydrogen and it is intended to prepare a compound in which R3' is C1-C6-alkyl, the product obtainable in this procedure is reacted with an alkylating agent to introduce a C1-C6-alkyl group.
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