A new pyrethroid of high insecticidal activity

New pyrethroids containing heterocyclic rings in the alcohol moieties were synthesised and their insecticidal activities were studied. Of these new pyrethroids, 3‐benzylpyrrol‐1‐ylmethyl (1RS‐cis, trans‐3(2,2‐dichlorovinyl)‐2,2‐dimethylcyclopropanecarboxylate was found to be the most effective, having higher activity than permethrin against Musca domestica by a topical application method. In addition, para‐substituted analogues of the 3‐benzylpyrrol‐1‐ylmethyl ester were also synthesised to study the substituent effects on insecticidal activities; the residual effects of these compounds against Blattella germanica were also examined.