| 摘要 |
- 14 - O.Z. 0050/38455 .gamma.-butyrolactones of the general formula I (I) where R1 is hydrogen or alkyl of 1 to 4 carbon atoms which may be substituted by lower alkoxy or acyloxy and R2 is hydrogen or straight-chain or branched alkyl which is unsubstituted or substituted by a functional group or is aryl, are prepared by reacting an alkylene oxide of the general formula II (II) with an acylacetate of the general formula III (III) where R1 and R2 have the above meanings and R3 and R4 are each alkyl of 1 to 6 carbon atoms or aryl, and R4 may furthermore be hydrogen, in the presence of a catalyst at elevated temperatures, by a process in which the reaction is carried out in the presence of an alkali metal halide, of an ammonium halide, preferably a quaternary ammonium halide, of a phosphonium halide, of an alkali metal phosphate or of an alkali metal carbonate at from 20 to 200.degree.C and under from 1 to 50 bar. |
