A process for the preparation of a 3-(arylvinyl)-2,2-dimethyl-cyclopropane-1-carboxylic acid ester of the formula ##STR1## in which Ar is an aromatic radical, R is alkyl or an alcohol radical customary in pyrethroids, and R.sup.1 is hydrogen, fluorine or chlorine, comprising reacting a compound of the formula ##STR2## with respectively, one, two or three equivalents of a base at a temperature between about -20.degree. and +60.degree. C. 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3-(芳基
乙烯基)-2,2-二
甲基环丙烷-1-
羧酸酯的方法,其中Ar是芳基,R是烷基或惯常用于拟
除虫菊酯的醇基,R.sup.1是氢、
氟或
氯,包括在约-20℃至+60℃的温度下,将式为##STR2##的化合物与一、二或三当量的碱分别反应。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。