An alkylphosphonyl nucleophilic substitution reaction that proceeds by an elimination–addition mechanism with an alkylidineoxophosphorane (phosphene) intermediate
Abstract
For the phosphonamidic chloride R2CHP(O)(NEt2) Cl having R2CH = 9-fluorenyl, substitution at phosphorus is unexpectedly fast with Et2NH as the nucleophile, and discriminates less than is usual between competing Me2NH and Et2NH nucleophiles; such behaviour is consistent with an elimination-addition mechanism and a fluorenylidineoxophosphorane intermediate 8.