| 摘要 |
The application relates to a process for the preparation of alkenyl aromatic compounds of the general formula I <IMAGE> in which R<1> can denote straight-chain or branched alkyl radicals having 1 to 12 carbon atoms or cycloalkyl radicals having 5 to 8 carbon atoms or aryl radicals, in which R<2> and R<3> are identical or different and hydrogen or radicals such as those under R<1> may be mentioned, and in which R<4> stands for hydrogen, hydrocarbon radicals such as R<1>, alkenyl radicals having 2 to 12 carbon atoms, alkoxy radicals having 1 to 12 carbon atoms, aryloxy radicals having 6 to 12 carbon atoms, the formyl radical, acyl radicals having 2 to 12 carbon atoms, acetal radicals having 3 to 12 carbon atoms, ester radicals having 2 to 12 carbon atoms, the cyano radical, halogen or a haloalkyl radical having 1 to 5 carbon atoms, for example -CF3, -CCl3, -CH2CF3, by reacting alkoxyalkyl aromatic compounds of the general formula II <IMAGE> in which R<1> to R<4> have the above meaning and R<5> stands for straight- chain or branched alkyl radicals, in the presence of acidic heterogeneous catalysts. |
