公开(公告)号：WO1990008132A1

公开(公告)日：1990-07-26

申请号：PCT/HU1990000006

申请日：1990-01-17

Applicant: CHINOIN GYOGYSZER ÉS VEGYÉSZETI TERMÉKEK GYARA ... ,  ZOLTAN, Sándor ,  HIDASI, Cyörgy ,  BERTOK, Béla ,  SZÉKELY, István ,  HAJIMICHAEL, Janis ,  BOTAR, Sándor ,  NAGY, Lajos ,  SOMFAI, Éva ,  LAK, István ,  RAPI, András ,  GAJARY, Antal ,  HEGEDÜS, Agnes ,  TARY, Mária

Inventor： CHINOIN GYOGYSZER ÉS VEGYÉSZETI TERMÉKEK GYARA ...

IPC: C07C255/14

CPC classification number: A01N53/00 ,  A01N25/22 ,  A01N2300/00

Abstract: The invention relates to a process for the preparation of such isomer mixtures of cypermethrine of formula (I), wherein carbon atoms indicated by 1,3 and α stand for a chiral carbon atom and the wavy line indicates cis or trans configuration related to the cyclopropane ring - which contains out of the theoretically possible 8-isomers of cypermethrine at least 95 % of 1RtransS and 1StransR (Ib) isomer pair or only a mixture of 1RcisS and 1ScisR (Ia) and the isomer pair (Ib) of the ratio (Ia):(Ib) = 55:45 - 25:75 by asymmetric transformation of second order performed in the presence of an amine base and solvent from a starting cypermethrine isomer mixture which contains next to the isomer pair (Ib) cis and other trans isomers or the isomer pair Ia + Ib at an undesired ratio.