| abstract |
Procedure for the preparation of new derivatives of 4-phenyl-2-methyl-1-buten-1-carboxylic acid, of the formula **(See formula)** in which R1 signifies a phenyl, phenoxy, phenylthio or cyclohexyl radical, optionally substituted by halogen, nitro, alkyl and/or, alkoxy, or a phenyl or cyclohexyl radical linked by means of an alkylene, alkylenedioxyl or alkylentium bridge member; R2 means cyano, carbamoyl or an alkoxycarbonyl, alkenyloxycarbonyl, alkynyloxycarbonyl, alkylcarbamoyl or dialkylcarbamoyl radical; and R3 signifies hydrogen or alkyl, constituents of the active component in antiparasitic agents, characterized by reacting a compound of the formula **(See formula)** in which R1 and R3 have the same meaning as before, with a phosphoric acid ester of the formula **(See formula)** in which R4 and R5 each signify C1-C4 alkoxy, while R2 has the same meaning as before, in the presence of a base. (Machine-translation by Google Translate, not legally binding) |