Fmc Corporation

Scott M Sieburth

John F Engel

Thomas G Cullen

Gary A Meier

Compounds of the formula ##STR1## in which Ar is substituted or unsubstituted phenyl, pyridinyl, furanyl, naphthyl, thienyl, or thiazolyl; R is a (C.sub.1-4) alkyl; W is oxygen or methylene; and Ph is substituted or unsubstituted phenoxyphenyl, benzylphenyl, phenyliminophenyl, benzodioxolyl, or benzoylphenyl, exhibit pyrethroid-like insecticidal activity with low toxicity to aquatic fauna.

Substituted phenyltrialkylsilane insecticides

Compounds of the formula ##STR1## in which Ar is substituted or unsubstituted phenyl, naphthyl, or thienyl; Z is oxygen, sulfur, or methylene; and Ar' is 2-methyl[1,1'-biphenyl]-3-yl, 3-phenoxyphenyl, 4-fluoro-3-phenoxyphenyl, or 6-phenoxy-2-pyridyl exhibit pyrethroid-like insecticidal and acaricidal activity and are relatively harmless to aquatic fauna.

Insecticidal cyclopropyl-substituted di(aryl) compounds

Compounds containing a dimethylsilane core and a phenoxybenzyl substituent are found to exhibit pyrethroid-like activity toward insects with low toxicity to fish.

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Princeton, NJ, United States of America

Scott M Sieburth