Procedure for racemizar HYDROLYZE esters and alkyl acid (-) - 2 - (4 - difluormetoxifenil metilbutirico) - 3.

摘要

Procedure for racemizar HYDROLYZE esters and alkyl acid (-) - 2 - (4 - difluorometoxifenil metilbutirico) - 3 - with one to two molar Equivalents of sodium or Potassium Hydroxide, in the presence of C1 - C3 anhydrous alcohol, at a temperature of 60 to 100 or the Boiling Point of methanol during A time period of 2 to 10 hours until the Reaction is essentially complete.The resulting Racemic acid was resolved into its components by means of optically Active salts prepared from the Racemic acid with optically active amines and subsequent Recovery of the Dextro rotatory isomer desired. It is used to prepare type pyrethroid pesticides.