AbstractThe pentaflurobenzyl esters of acids related to chrysanthemic acid are active insecticides. Formal substitution of one or more of the fluorines in pentafluoro‐benzyl alcohol has led to a new series of insecticidal compounds. The synthesis of these esters has some novel aspects. Key factors contributing to the insecticidal activity of these esters in soil, particularly against corn root worm, are discussed, including rates of degradation and vapour pressur
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