Some Insecticidal Properties of Fluorine Analogues of DDT1

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Abstract
A study was made of some of the insecticidal properties of 2,2-bis-(p-fluorophenyl)-l,l,l-trichloroethane, DFDT, as compared with DDT; and of the comparative insecticidal actions of these and related fluorinated and chlorinated materials on 12 spp. of insects. Crystalline DFDT was about 8 to 10 times as soluble as DDT in several solvents commonly used in insecticidal formulations. DFDT was about equal to DDT in its initial toxicity to most of the insects studied and was more rapid in its toxic action. Of 7 pairs of related compounds differing only in the substitution of C and F atoms, the presence of aromatic F atoms in the p,p-position greatly increased the speed of toxic action and in general appeared to produce the more toxic compounds. The substitution of F for Cl in the aliphatic portion of the DDT-type molecule resulted in a marked decrease in toxicity.

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