Procedeu de preparare a amestecului de izomeri ai zipermetrinei sub forma de produs cristalin stabilizat

The invention is related to a method of obtaining a mixture of cypermethrin isomers in form of stabilised crystalline product with the formula:in which carbon atoms in position 1,3 and a are chiral carbon atoms, waved line indicates a cys-or transconfiguration in relation with cyclopropane ring, the...

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Main Authors HEGEDUS AGNES, RAPI ANDRAS, HIDASI GYORGY, BERTOK BELA, ZOLTAN SANDOR, SOMFAI EVA, SZEKELY ISTVAN, BOTAR SANDOR, HAJIMICHAEL JANIS, LAK ISTVAN, TARY MARIA, NAGY LAJOS, GAJARY ANTAL
Format Patent
LanguageRomanian
Published 30.09.1995
Edition6
Subjects
APPARATUS THEREFOR
CHEMISTRY
GENERAL METHODS OF ORGANIC CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The invention is related to a method of obtaining a mixture of cypermethrin isomers in form of stabilised crystalline product with the formula:in which carbon atoms in position 1,3 and a are chiral carbon atoms, waved line indicates a cys-or transconfiguration in relation with cyclopropane ring, the final mixture of isomers from 8 cypermethrin isomers, theoretically possible, containing, at least 95% or of the couple of isomers IR treans S and IS trans R (Ib) or of the mixture of couple of isomers IR cis S and IS cis R (Ia) and of couple of isomers (Ib) în relations (Ia):(Ib)= 55:45-25:75, obtained through the lop-sided transformation of degree II in the presence of an amine base and a dissolver from initial mixture of cypermethrin isomers, the mixture containing alike the couple of isomers (16) cys-and the other transisomers or couple of isomers Ia+Ib in one undesirable relation.
Bibliography:Application Number: MD19940000329