A process for the preparation of a styrylcyclopropane-1-carboxylic acid ester of the formula ##STR1## in which R is C.sub.1-4 -alkyl or an alcohol radical customary in pyrethroids, R.sup.1 is alkoxy or alkylthio, either of which may be optionally substituted by halogen, R.sup.2 is hydrogen or alkoxy, or R.sup.1 and R.sup.2 together are optionally halogen-substituted alkylenedioxy, and R.sup.3 is hydrogen or chlorine, comprising reacting an ester of the formula ##STR2## in which Hal is chlorine or bromine, with a base. The compounds are insecticidally active. Numerous syntheses of the starting materials, some involving new intermediates, are also shown.
一种制备式为##STR1##的STyrylcyclopropane-1-
羧酸酯的方法,其中R为C.sub.1-4-烷基或在拟除虫剂中常见的醇基团,R.sup.1为烷氧基或烷
硫基,二者可选择性地被卤素取代,R.sup.2为氢或烷氧基,或者R.sup.1和R.sup.2一起可选地被卤素取代的烷基二氧基,R.sup.3为氢或
氯,包括将式为##STR2##的酯与碱反应。这些化合物具有杀虫活性。还展示了许多起始材料的合成方法,其中一些涉及新的中间体。