Compounds having the formula ##STR1## in which R is methyl or ethyl, Y is sulfur or oxygen, and R.sub.1 and R.sub.2 are the same or different tertiary alkyl groups each having from 4 to 6 carbon atoms, are insecticides and nematicides, especially for control of soil insects and nematodes. Symmetrical compounds (R.sub.1 .dbd.R.sub.2) may be prepared by reaction of an alkali metal mercaptide with an alkyl (thio) phosphonic dihalide. The alkali metal mercaptide may be prepared by reaction of a tertiary alkyl mercaptan with an alkali metal or alkali metal hydride.
化合物的
化学式为##STR1##其中R为甲基或乙基,Y为
硫或氧,R.sub.1和R.sub.2是相同或不同的四到六个碳原子的三级烷基,是
杀虫剂和线虫杀剂,特别是用于控制土壤昆虫和线虫。对称化合物(R.sub.1.dbd.R.sub.2)可以通过碱
金属巯基化物与烷基(
硫)
磷酸二卤代物反应制备。碱
金属巯基化物可以通过三级烷基巯基与碱
金属或碱
金属
氢化物反应制备。