CYKLOPROPANKARBOXYLSYRA-DERIVAT, FORFARANDE FOR FRAMSTELLNING DERAV, INSEKTICIDISK OCH/ELLER AKARICIDISK KOMPOSITION INNEHALLANDE NEMNDA DERIVAT SAMT ANVENDNING AV DERIVATET ELLER KOMPOSITIONEN

摘要

There is provided a compound of formula wherein R<1> and R<2> are each independently selected from chlorine, bromine and methyl, in the form of a 1:1 mixture of the 1RcisS- and 1ScisR- isomers substantially free of 1ScisS- and 1RcisR-isomers, processes for preparing such compounds, and their use as pesticides. Compounds according to the invention contain up to four times as much of the most active isomer of the compound of formula I as a compound containing equal amounts of all eight possible isomers, and they are readily prepared by routes which do not involve any stereospecific synthesis or optical resolution steps.