Method to prepare (+)-cis-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid
AssigneeFMC Corporation
InventorsKiyoshi Kondo, Minoru Suda
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Abstract
Process to prepare 3-(2,2-dichloroethenyl)-2,2-di-methylcyclopropanecarboxylic acid enriched with the (+)-cis isomer.
Claims4
A method to prepare 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid containing at least 50% (+)-cis isomer which comprises neutralizing racemic cis, trans-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid containing at least 40 percent cis isomers with an alkaloid base selected from 1-ephedrin or quinine in a solvent selected from ethyl acetate or acetonitrile, cooling the resulting solution, isolating the precipitated salt, and hydrolyzing the salt to produce the enriched acid.
Dependencies are inferred from the claim text.