| 摘要 |
The invention is directed at a new process for the preparation of pure enantiomers from the racemate of amidoacetonitrile compounds of formula wherein R<SUB>1</SUB>, R<SUB>2 </SUB>and R<SUB>3</SUB>, independently of each other, signify hydrogen, halogen, nitro, cyano, C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy, C<SUB>2</SUB>-C<SUB>6</SUB>-alkenyl, halogen-C<SUB>2</SUB>-C<SUB>6</SUB>-alkenyl, C<SUB>2</SUB>-C<SUB>6</SUB>-alkinyl, halogen-C<SUB>2</SUB>-C<SUB>6</SUB>-alkinyl, C<SUB>2</SUB>-C<SUB>6</SUB>-alkenyloxy, halogen-C<SUB>2</SUB>-C<SUB>6</SUB>-alkenyloxy, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylthio, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkylthio, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylsulfonyloxy, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkylsulfonyloxy, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylsulfinyl, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkylsulfinyl, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylsulfonyl, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkylsulfonyl, C<SUB>1</SUB>-C<SUB>6</SUB>-alkenylthio, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkenylthio, C<SUB>1</SUB>-C<SUB>6</SUB>-alkenylsulfinyl, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkenylsulfinyl, C<SUB>1</SUB>-C<SUB>6</SUB>-alkenylsulfonyl, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkenylsulfonyl, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylamino, di-(C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl)amino, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylaminocarbonyl, di-(C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl)aminocarbonyl, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylsulfonylamino, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkylsulfonylamino, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylcarbonyl, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkylcarbonyl, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxycarbonyl, unsubstituted or one- to five-fold substituted phenyl, unsubstituted or one- to five-fold substituted phenoxy, unsubstituted or one- to five-fold substituted phenylacetylenyl, unsubstituted or one- to four-fold substituted pyridyloxy, unsubstituted or one- to four-fold substituted pyridyl or unsubstituted or one- to seven-fold substituted naphthyl, the substituents in each case being selected from the group consisting of halogen, nitro, cyano, C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl, halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy and halogen-C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy, which are useful in the control of endo- and ectoparasites in and on warm-blooded animals, especially productive livestock and domestic animals, as well as on plants.
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