Process for the preparation of cypermethrine isomers
作者： Éva Somfai , István Székely , András Rapi , Lajos Nagy , Cyörgy Hidasi
DOI:
关键词: Asymmetric carbon 、 Base (chemistry) 、 Cyclopropane 、 Atom 、 Cis–trans isomerism 、 Amine gas treating 、 Chemistry 、 Stereochemistry 、 Solvent 、 Ring (chemistry)
摘要: The invention relates to a process for the preparation of such isomer mixtures cypermethrine formula (I), wherein carbon atoms indicated by 1,3 and α stand chiral atom wavy line indicates cis or trans configuration related cyclopropane ring - which contains out theoretically possible 8-isomers at least 95 % 1RtransS 1StransR (Ib) pair only mixture 1RcisS 1ScisR (Ia) ratio (Ia):(Ib) = 55:45 25:75 asymmetric transformation second order performed in presence an amine base solvent from starting next other isomers Ia + Ib undesired ratio.
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