How is Diethyl [(2-chloroethoxy)methyl]phosphonate (CAS: 116384-56-6) typically synthesized?

Diethyl [(2-chloroethoxy)methyl]phosphonate (CAS: 116384-56-6) is typically synthesized via a multi-step process involving the chlorination of ethylene glycol followed by the reaction with diethyl phosphate. The synthesis often requires mild to moderate conditions and can be catalyzed by phosphorus oxychloride, with yields typically ranging from 70% to 90%. The final product is a clear, colorless to slightly yellow liquid.