Isovalerato of alpha cyano - 3 - fenoxibenzil 2 - (4 - clorofenila)Process for preparing a mixture of isovalerato of (s) - alpha cyano - 3 - fenoxibenzil (s) - 2 - (4 - clorofenila) and isovalerato of (R) - alpha cyano - 3 - fenoxibenzil (R) - 2 - (4 - clorofenila)Process for preparing isovalerato of alpha cyano - 3 - fenoxibenzil 2 - (4 - clorofenila), insecticide and acaricide and composition process to kill insects or micuins

摘要

PURPOSE:A mixture of phene valerate Aalpha and Bbeta is crystallized using racemic phene valerate as a solvent to obtain title compound useful for insecticide in high yield. CONSTITUTION:A mixture of (S)-alpha-cyano-3-phenoxybenzyl (S)-2-(4-cyloro- phenyl)-isolvalerate, phene valerate Aalpha, and (R)-alpha-cyano-3-phenoxybenzyl (R)-2- (4-chlorophenyl) isovalerate, phene valerate Bbeta, is precipitated as crystals from the solvent of (R,S)-alpha-cyano-3-phenoxybenzyl (R,S)-2-(4-chlorophenyl)isovalerate, racemic phene valerate, to obtain the objective compound. EFFECT:The insecticidal efficacy of phene valerate is doubled with no use of optically active intermediate.