Process for the preparation of cypermethrine isomers

Details Process for the preparation of cypermethrine isomers Process for the preparation of cypermethrine isomers

C - Chemistry, Metallurgy

07

C

260/496.6, 167/1

C07C 255/39 (2006.01) A01N 25/22 (2006.01) A01N 53/00 (2006.01)

Patent

CA 2020356

The invention relates to a process for the preparation of such isomer mixtures of cypermethrine of formula (I), wherein car- bon atoms indicated by 1,3 and .alpha. 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 1 RtransS 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 cy- permethrine 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.

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