A mild and facile synthesis of alkyl-and arylphosphonyl dichlorides under neutral conditions. Reaction of bis (trimethylsilyl) phosphonates with PCl5.

~61%

~95%

~79%

~93%

~0%

~0%

~0%

~0%

~0%

~0%

~0%

~0%

~85%

~93%