Task: Translation
Input (Czech): Zpusob prípravy 2-chlormethylthiofenu vzorce I chlormethylací thiofenu v prítomnosti alespon jednoho di-(C.sub.1-6.n.)alkylketonu. Pripravený 2-chlormethylthiofen se muže prevádet na 2-thienylacetonitril vzorce II. Slouceniny vzorce I a II jsou meziprodukty ruzných farmaceuticky aktivních látek.
Output (English): In the present invention, there is disclosed a process for preparing 2-chloromethyl-thiophene of the general formula I by chloromethylation of thiophene in the presence of at least one dialkyl-ketone containing 1 to 6 carbon atoms in the alkyl moiety. The prepared 2-chloromethyl-thiophene can be transformed into 2-thienyl-acetonitrile of the general formula II. The compounds of the general formulae I and II are intermediates of various pharmaceutically active substances.