Description:
<jats:title>Abstract</jats:title><jats:p>Starting from derivatives of cyclobutanone the synthesis is described of α‐cyano‐3‐phenoxybenzyl esters of 2,2‐dimethylcyclopropanecarboxylic acid, substituted in the 3‐position of the cyclopropane ring by an alkoxy, alkylthio, phenoxy or phenylthio group. The insecticidal activities of these synthetic pyrethroids towards adult <jats:italic>Musca domestica</jats:italic>, and larvae of <jats:italic>Aedes aegypti, Spodoptera littoralis</jats:italic> and <jats:italic>Heliothis virescens</jats:italic> are reported and compared with known pyrethroids.</jats:p>