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摘要

A compound of formula: IMAGE wherein one of R1 and R2 represents a group of formula: W(CF2)m- where W represents an atom of hydrogen, fluorine or chlorine and m has the value one or two, and the other of R1 and R2 represents an atom of fluorine, chlorine or bromine or a group of formula: IMAGE where each of X, Y and Z independently represents an atom of hydrogen, fluorine or chlorine, and R3 represents an atom of hydrogen, or the cyano or ethynyl group. The compounds are useful against insect or acarine pests.