| 摘要 |
<p>A method for preparing a pyrethroid insecticide of general formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="28" wi="97" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein the two hydrogen atoms on the cyclopropane ring are in the cis- configuration, in which an acid of formula:
<Chemistry id="chema02" num="0002"><Image id="ia02" he="32" wi="65" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>is neutralised with a water-soluble base and then reacted in the presence of a phase-transfer catalyst with a solution in a substantially water-immiscible organic solvent of an alpha-cyanobenzyl aryl sulphonate of formula:<!-- EPO <DP n="2"> --><Chemistry id="chema03" num="0003"><Image id="ia03" he="22" wi="92" file="IMGA0003.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>the substituents in the formulae having the following meanings; A represents an optionally substituted aryl group; R, and R<Sub>2</Sub> represent hydrogen or halogen; and R<Sub>3</Sub> and R<Sub>4</Sub> represent chlorine, bromine, or methyl.</p> |
