| 摘要 |
The invention relates to a process for the preparation of the products of formula I: …<IMAGE>… in all their possible stereoisomeric forms as well as the mixtures of these stereoisomers, in which formula R represents the residue of an alcohol used in the pyrethrinoid series or the residue of an alcohol capable of blocking the acid function, and Z represents an electron-attracting group, characterised in that a product of formula (II): …<IMAGE>… in all their possible stereoisomeric forms as well as the mixtures of these stereoisomers, in which formula Z and R retain their meaning given above and Hal represents a bromine, chlorine or iodine atom, is subjected to the action of sodium trifluoroacetate in the presence of cuprous iodide. …<??>The compounds thus prepared possess advantageous properties as pesticides and in parasite control. |
