NEW PROCESS OF PREPARATION FOR TRIFLUOROMETHYLVINYL DERIVATIVES STARTING WITH APPROPRIATE HALOGENOVINYL DERIVATIVES

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.