| 摘要 |
Alpha,beta-substituted acroleins of the general formula I <IMAGE> (I) where A and B are identical or different and are each C1-C4-alkyl, naphthyl, biphenyl or phenyl which may be monosubstituted or polysubstituted by halogen, nitro, C1-C4-alkyl, C1-C4-alkoxy, C1-C4-haloalkyl, phenoxy or phenylsulfonyl, are prepared by a process in which a compound of the general formula III <IMAGE> (III) where A has the above meanings and R1 and R2 are identical or different and are each C1-C4-alkyl or together possess the carbon atoms required to complete a ring, is reacted with a phosphorus compound of the general formula IV or V <IMAGE> (IV) <IMAGE> (V) where B the meanings stated above, R1 and R2 are as defined above and X(-) is a halide ion, in the presence of a base. The alpha,beta-substituted acroleins can be further processed to give hydroxymethyloxiranes.
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