Toxicity to Flies of Derivatives of Eugenol and Cis- and Trans- lsoeugenol

IT appears that any modification in the pentadienyl side-chain of the pyrethrin molecules induces a profound depression in the insecticidal activity¹. Although the distribution of the double bonds in the side-chain of pyrethrolone is not yet fully established², there seems to be little doubt that there is either a terminal = CHCH₃ grouping or-less probably-the = CH₂ group. Allyl phenols have been found to possess insecticidal properties³, and it appeared of interest to compare the toxicity in fly sprays of corresponding derivatives of the isomeric phenols eugenol (which contains the allyl grouping) and Soeugenol (containing the propenyl grouping).