Novel 2-(2,2-difluorocyclopropyl)-acetic acid derivatives of formula I ##STR1## wherein A is oxygen or --NR.sub.1 --, B is C.sub.2 -C.sub.6 alkylene, D is oxygen, sulfur or --O--CH.sub.2 --, E is phenyl; phenyl substituted by from one to three substituents selected from the group halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.3 haloalkyl and C.sub.1 -C.sub.4 alkoxy; a five-membered aromatic heterocycle having from one to three hetero atoms selected from the group nitrogen, oxygen and sulfur; a five-membered aromatic heterocycle having from one to three hetero atoms selected from the group nitrogen, oxygen and sulfur that is substituted by one or two substituents selected from the group halogen, C.sub.1 -C.sub.4 alkyl and C.sub.1 -C.sub.3 haloalkyl; a six-membered aromatic heterocycle having from one to three nitrogen atoms; or a six-membered aromatic heterocycle having from one to three nitrogen atoms that is substituted by one or two substituents selected from the group halogen, C.sub.1 -C.sub.4 alkyl and C.sub.1 -C.sub.3 haloalkyl, L is halogen or methyl, n is 0, 1 or 2, and R.sub.1 is hydrogen, C.sub.1 -C.sub.4 alkyl, phenylthio or tolylthio, can be used as pesticides. Especially insects and arachnids can be controlled.
公式为I的Novel 2-(2,2-二
氟环丙基)
乙酸衍
生物,其中A为氧或--NR1--,B为C2-C6烷基,D为氧、
硫或--O--
CH2--,E为苯基;苯基上取代有1-3个卤素、C1-C4烷基、C1-C3卤代烷基和C1-C4烷氧基的基团;含1-3个杂原子(氮、氧和
硫)的五元芳香杂环;含1-3个杂原子(氮、氧和
硫)的五元芳香杂环,其上取代有1-2个卤素、C1-C4烷基和C1-C3卤代烷基的基团;含1-3个氮原子的六元芳香杂环;含1-3个氮原子的六元芳香杂环,其上取代有1-2个卤素、C1-C4烷基和C1-C3卤代烷基的基团,L为卤素或甲基,n为0、1或2,R1为氢、C1-C4烷基、苯
硫基或
甲苯硫基,可用作
杀虫剂。特别是可以控制昆虫和蜘蛛。