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US 4,359,580 AGranted
Process for the preparation of sulfur ylide intermediates of insecticidal pyrethroids
AssigneeAmerican Cyanamid Company
InventorCharles P. Grasso
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Abstract
The invention is an improved process for the preparation of lower alkyl esters of tetrahydrothiophenium carboxymethylide intermediates of insecticidal pyrethroids, and to insecticidal prethroids derived from said ylides.
Claims1
A method for the preparation of a compound of the formula ##STR8## which comprises reacting a compound of the formula ##STR9## with solid particulated sodium hydroxide used in 2:1 to 3:1 molar amount per mole of the compound of formula II in a solvent of methylene chloride, and a temperature range of 20.degree. C. to 30.degree. C.
Dependencies are inferred from the claim text.