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Derivatives of 3‐phenoxybenzyl pyrethroidal esters were synthesised in which rotation about the benzylic C‐1–C‐α bond was restricted by an additional bridging ring. The insecticidal activities of these compounds to houseflies ( Musca dornestica ) and mustard beetles ( Phaedon cochleariae ) depended on the size of the bridging unit and on whether it joined C‐α to C‐2 or C‐6 of the benzyl nucleus. The results obtained are considered in relation to current correlations of the structures with the activities of pyrethroids.
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Elliott et al. (1981) studied this question.
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