Crystalline, insecticidal pyrethroid
AssigneeFMC Corporation
InventorLeland A. Smeltz
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Abstract
A crystalline, optically inactive compound, each crystal comprising an equimolar mixture of the isomers (S)-(cyano)(3-phenoxyphenyl)methyl (1R,cis)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate and (R)-(cyano)-(3-phenoxyphenyl)methyl (1S,cis)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate, its preparation by a cyclic crystallization/equilibration process, and its utility as an insecticide are described and exemplified.
Claims4
A crystalline insecticidal compound, each crystal of which comprises substantially equimolar amounts of the isomers of the enantiomer pair (S)-(cyano)(3-phenoxyphenyl)methyl (1R,cis)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate and (R)-cyano)(3-phenoxyphenyl)methyl (1S-cis)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate.
Dependencies are inferred from the claim text.