Asymmetric OS-dialkyl-O-[(methoxyphenyl)-vinyl]-thiophosphates
 Compounds of the formula ##EQU1## wherein R.sub.1 represents methyl or ethyl, PA1 R.sub.2 represents propyl or butyl, preferably n-propyl, or isobutyl, PA1 (R.sub.3).sub.n represents one or more hydrogen atoms, or represents similar or different chlorine, bromine, methyl or methoxy, n is 1, 2 or 3, PA1 Y represents hydrogen or chlorine and Hal represents chlorine or bromine and their use for combating insects and members of the order Acarina are disclosed. 
Ciba-Geigy AG
C C A
C07F C07F A01N
inventional inventional inventional
Paul L. Alexis A.
Valint Oswald