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Abstract
Various insecticides belonging to the O-alkyl-O-(subst. phenyl) phenylphosphonothioate family were prepared and their biological activities studied. Besides O-ethyl-O-(4-nitrophenyl) phenylphosphonothioate, which is utilized in these days, another compound, O-ethyl-O-(4-cyanophenyl) phenylphosphonothioate, proved to have excellent properties as an insecticide.
In our previous paper, it was reported that O,O-dimethyl-O-(4-cyanophenyl) phosphorothioate (S-4084) has only a low toxicity towards mammals though possessing a high activity towards rice stem borers. In this paper, the chemical and biological properties of S-4084 and its phenylphosphonothioate derivative (S-4087) will be reported in detail. It should especially be noted that S-4084 had a higher activity towards rice stem borers than S-4087 by topical or pot test in a room or in a green-house, but by field test S-4087 was stronger than S-4084.