

June 1955 ARS-33-9 



United States Department of Agriculture 

 Agricultural Research Service 



PRELIMINARY TESTS WITH SOME N-SUBSTITUTED 

 p-ETHOXYBENZAMIDES FOR SYNERGISTIC ACTION IN 

 ALLETHRIN FLY SPRAYS 



S. I. Gertler, W. A. Gersdorff, and P. G. Piquett, 

 Entomology Research Branch 



Several groups of compounds have been examined at the Beltsville, Md., . 

 laboratory in an effort to find new synergists for pyrethrins and allethrin.— ' 

 In this study a group of p-ethoxybenzamides were tested for possible 

 synergism with allethrin. 



All the compounds were prepared by reacting p-ethoxybenzoyl chloride 

 with various amines under suitable conditions. They may be represented 

 by the general formula 



O 



II /R 



C2H50-<^-C-N 



\R 



where R is hydrogen or an alkyl group and R-'^ is an alkyl, aryl, cyclo- 

 aliphatic, or heterocyclic group. 



The compounds were incorporated in sprays, alone and in mixtures 

 with 50 mg. of allethrin per deciliter of solvent, 1 part of acetone to 3 

 parts of refined kerosene. Insofar as practicable the mixtures were 

 prepared in the proportion of 10 parts of adjunct to 1 part of allethrin. 

 Even though acetone was used as an auxiliary solvent, the solubility of 

 some compounds was so low that the concentration of the adjunct was 

 lowered to 250 mg. per deciliter. In the sprays containing the adjunct 

 alone the concentrations ranged from 333 to 2000 mg. per deciliter. 



Allethrin standards were prepared in the same solvent mixture at 

 50, 100, and 200 mg. per deciliter. The allethrin used was from a 

 distilled sample of high purity (94 percent by the hydrogenolysis method). 



\_l For reports on other groups of compounds see Bur. Ent. and Plant 

 Quar. E-805, E-828, E-837, E-848, and E-869. 



