Insecticidal activity of the pyrethrins and related compounds. Part XI. Relative potencies of isomeric cyano‐substituted 3‐phenoxybenzyl esters

Abstract

Abstract The insecticidal activities to Musca domestica L. and Phaedon cochleariae Fab. of a series of 3‐phenoxybenzyl pyrethroid esters with a cyano substituent at the 2‐, 6‐. ( R )‐α‐, or ( S )‐α‐position are compared with those of the unsubstituted analogues. Only an ( S )‐α‐substituent enhances activity; others diminish or almost eliminate it. ( RS )‐α‐mixtures are generally less active than would be predicted from the potencies of their separate constituents.