Organophosphorus esters of the formula (I), ##STR1## wherein R is a C.sub.1 -C.sub.2 alkyl group, R.sub.1 is a C.sub.1 -C.sub.2 alkyl, C.sub.1 -C.sub.2 alkoxy, C.sub.1 -C.sub.4 alkylamino, phenyl or phenoxy group, R.sub.2 and R.sub.3, which may be the same or different, are each a C.sub.1 -C.sub.5 alkyl or methoxy C.sub.2 -C.sub.3 alkyl group and X is an oxygen or sulfur atom, a method for producing organophosphorus esters of the formula (I) characterized by condensation reaction of s-triazines of the formula, ##STR2## wherein M is a potassium or sodium atom and R.sub.2 and R.sub.3 are as defined above, with a halogenated compound of the formula, ##STR3## wherein Y is a halogen atom and R, R.sub.1 and X are as defined above, and an insecticide, acaricide and/or nematocide characterized by containing organophosphorus esters of the formula (I) as an active ingredient.
式(I)的有机
磷酸酯,其中R是C.sub.1-C.sub.2烷基,R.sub.1是C.sub.1-C.sub.2烷基,C.sub.1-C.sub.2烷
氧基,C.sub.1-C.sub.4烷基
氨基,
苯基或
苯氧基,R.sub.2和R.sub.3,可以相同也可以不同,分别是C.sub.1-C.sub.5烷基或甲
氧基C.sub.2-C.sub.3烷基,X是
氧或
硫原子,一种制备式(I)的有机
磷酸酯的方法,其特征在于将式中的s-三嗪化合物与式中的卤代化合物进行缩合反应,其中M是
钾或
钠原子,R.sub.2和R.sub.3如上所定义,Y是卤素原子,R,R.sub.1和X如上所定义,以及一种
杀虫剂,
杀螨剂和/或杀线虫剂,其特征在于含有式(I)的有机
磷酸酯作为活性成分。