The present invention relates to new cyclic organophosphorus esters having the following structures: ##EQU1## where R is aryl or chloroalkyl of 2 to 10 carbon atoms, R' is aryloxy or chloroalkyloxy of 2 to 10 carbon atoms, R" is hydrogen, alkyl, alkenyl, furanyl or aryl of 1 to 15 carbon atoms and substituted aryl forms where the substituent is fluorine, chlorine, bromine, cyano, hydroxyl, alkyloxy, alkylthio or mixtures of such substituents, and Y is O or S. The organophosphorus compounds have biological activity and are also useful as fire retardants, and as lead scavengers in gasoline.
                            本发明涉及具有以下结构的新的环
磷酸酯化合物:##EQU1## 其中,R是2至10个碳原子的芳基或
氯代烷基,R'是2至10个碳原子的芳氧基或
氯代烷氧基,R"是1至15个碳原子的氢、烷基、烯基、
呋喃基或芳基,其中取代基为
氟、
氯、
溴、
氰、羟基、烷氧基、烷
硫基或这些取代基的混合物,Y为O或S。这些有机
磷化合物具有
生物活性,也可用作阻燃剂和汽油
铅清除剂。