CONVERSION METHOD OF A STARTING MIXTURE OF ISOMERIC PYRETHROIDS SUCH AS CYPERMETHRINE AND CYPHLATRINE CONTAINING LESS PESTICIDALLY ACTIVE ISOMERS TO PESTICIDALLY MORE ACTIVE ISOMERS

摘要

the solution concerns the conversion of mixtures of isomeric pyrethroids, cypermethrin and cyfluthrin and containing less pesticidnu011b active isomers on pesticidnu011b potent isomers,that this mixture shall be in contact with the bazu00ed, so that (a) prepare a suspension in a liquid starting mixture alifaticku00e9m or cykloalifaticku00e9m hydrocarbon 5 to 16 carbon atoms.in which pesticidnu011b effective isomers of practically nezozpustnu00e9, pu0159u00edu010demu017e mass ratio is 1: initial hydrocarbon mixture to 1 to 1: 4, (b) suspension shall be in contact with the bazu00ed in the presence of a catalyst.basically, soluble in a liquid environment and velenu00e9ho of kvarternu00edch ammonium compounds, kvarternu00edch fosfoniovu00fdch compounds and crown - ethers.the mass ratio of the mixture to the base is 10: 1 to 20: 1 and the weight of base is greater than the mass of the catalyst.(c) the resulting mixture is stirred for maintaining the temperature in the range from 5 to 35.sup.o.n.c, and (d) the vykrystalovanu00e9 isomers from hydrocarbon and separated.