PESTICIDAL POLYHALOALKENE DERIVATIVES

Polyhaloalkene compounds of formula (I), wherein X is sulfur, oxygen, nitrogen or methylene, Y and Y independently are fluorine, chlorine or bromine, Z is hydrogen or the same as Y or Y , and n is 1-4; provided that: (A) when X is sulfur, R is thiazolyl substituted thienyl, optionally substituted thianaphthyl, optionally substituted thiazolinyl, optionally substituted thiadiazolyl, optionally substituted oxadiazolyl or 3,4,4- trifluoro-3-butenyloxycarbonyl-methyl; (B) when X is oxygen, R is C(O)R wherein R is perfluoroalkyl, optionally substituted phenyl, optionally substituted thienyl, optionally substituted furanyl, optionally substituted pyrrolyl or dihydrothiazolylthiomethyl; (C) when X is nitrogen, R taken with the nitrogen is an isothiocyanate, succinimide or saccharine group; and (D) when X is methylene, R is hydroxy. The compounds exhibit activity against plant nematodes and helminths that are indicators of animal anthelmintic activity and therefore are useful in agriculture and veterinary practice.