PROCESS FOR THE PREPARATION OF CYPERMETHRINE ISOMERS

PCT No. PCT/HU90/00006 Sec. 371 Date Oct. 19, 1990 Sec. 102(e) Date Oct. 19, 1990 PCT Filed Jan. 17, 1990 PCT Pub. No. WO90/08132 PCT Pub. Date Jul. 26, 1990.The invention relates to a process for the preparation of such isomer mixtures of cypermethrine of the Formula (I) (I) wherein carbon atoms in...

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Hauptverfasser:	GAJARY, ANTAL, HIDASI, CYOERGY, SZEKELY, ISTVAN, TARY, MARIA, HEGEDUES, AGNES, BOTAR, SANDOR, HAJIMICHAEL, JANIS, ZOLTAN, SANDOR, LAK, ISTVAN, BERTOK, BELA, NAGY, LAJOS, SOMFAI, VA, RAPI, ANDRAS
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS AGRICULTURE ANIMAL HUSBANDRY BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES CHEMISTRY FISHING FORESTRY HUMAN NECESSITIES HUNTING METALLURGY ORGANIC CHEMISTRY PEST REPELLANTS OR ATTRACTANTS PLANT GROWTH REGULATORS PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF TRAPPING
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Zusammenfassung:	PCT No. PCT/HU90/00006 Sec. 371 Date Oct. 19, 1990 Sec. 102(e) Date Oct. 19, 1990 PCT Filed Jan. 17, 1990 PCT Pub. No. WO90/08132 PCT Pub. Date Jul. 26, 1990.The invention relates to a process for the preparation of such isomer mixtures of cypermethrine of the Formula (I) (I) wherein carbon 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 1RtransS and 1StransR (Ib) isomer pair or only a mixture of 1RcisC 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.