| 摘要 |
Process for the preparation of 5-hydroxyethylpyrrolidones of the general formula I <IMAGE> in which R<1> represents hydrogen, C1- to C12-alkyl, C3- to C8-cycloalkyl, aryl or C7- to C12-aralkyl, in which a) a caprolactone of the general formula II <IMAGE> or b) a butyrolactone of the general formula III <IMAGE> in which R<2> represents C1- to C12-alkyl, <IMAGE>, R<3> has the meaning of R<2> and additionally represents hydrogen and R<4> represents C1- to C8-alkyl and phenyl, is reacted with ammonia or primary amines of the general formula IV <IMAGE> in which R<1> has the abovementioned meanings, at temperatures from 150 to 450 DEG C and pressures from 10 to 350 bar, and the preparation of the caprolactones II and of the butyrolactones III from the cyclohexanones V.
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