Insecticidal activity of the pyrethrins and related compounds. IX. 5‐benzyl‐3‐furylmethyl 2,2‐dimethylcyciopropanecarboxylates with non‐ethylenic substituents at position 3 on the cyclopropane ring

The insecticidal activities against houseflies (Musca domestica L.) and mustard beetles (Phaedon cochleariae Fab.) of 29 new 5‐benzyl‐3‐furylmethyl 2,2‐dimethyl‐cyclopropane‐carboxylates are compared with those of the corresponding chrysanthe‐mate (bioresmethrin) to assess the influence of non‐ethylenic and isobutenyl substituents at position 3 of the cyclopropane ring. Of the new groups investigated, only 3‐methoxyiminomethyl gives equal or enhanced activity; 3‐(2‐furyl) esters are moderately effective, but 3‐phenyl and 3‐alkoxycarbonyl compounds show weak activity. A 3‐(2,2,2‐trihaloethyl) compound was more active than compounds with other saturated groups, such as isobutyl.