In the previous paper^[1], we reported the formation of bis(O,O-diethyldi:hiophosphate) disulfide as an intermmediate product in the course of chlorination of O,O-diethyldithiophos phone acid. During the past decade, much effort has been directed wards the synthesis of mixed phosphoric esiers and esters of phosphoric anhydrides, some of them being found as powerful insecticides.