Novel organophosphorus ester derivatives of the formula (I) wherein R1 represents alkyl, R2 represents alkyl or thioalkyl, R3, R4, and R. may be the same or different and each represents hydrogen, halogen, alkylothio, nitro, cyano, alkyl, alkylsulfinyl, or trifluoromethyl, and X represents oxygen or sulfur, process for their preparation, and insecticides containing them as effective ingredients.
式(I)的新型有机
磷酯衍
生物,其中R1代表烷基,R2代表烷基或
硫代烷基,R3、R4和R.可以相同或不同,各自代表氢、卤素、
硫代烷基、硝基、
氰基、烷基、烷基亚磺酰基或三
氟甲基,X代表氧或
硫,其制备方法以及含有它们作为有效成分的
杀虫剂。