PROCESS FOR PREPARING DIALKYLPHOSPHOROCHLORIDOTHIOATES, THE USE OF THE SO PREPARED COMPOUNDS AS INTERMEDIATES, AND THE USE OF SOME OF THE FINAL PRODUCTS AS INSECTICIDES

摘要

A process for deriving certain O,O-dialkyl phosphorochloridothioates in the substantial absence of contamination by free sulfur and avoiding difficult-tohandle sulfur distillation residue, in which process distillation to recover substantially pure product is carried out in the present of a sulfur-solubilizing agent. The process may be used in separating the desired product from a mixture thereof with sulfur produced by reaction of phosphorus pentasulfide and an alkanol, chlorinating and converting by-product sulfur monochloride to free sulfur. The agent is a liquid aromatic compound having at least ten carbon atoms and selected from alkylated and/or chlorinated naphthalenes and anthracenes, and naphthalene, diphenyl and terphenyls, preferably a naphthalene or naphthalenic oil.
The product O,O-dialkyl phosphorochloridothioates have utility in, for example, the preparation of insecticides.