Generation of a pentaco-ordinated protonated oxyphosphorane in equilibrium with the isomeric enol phosphonium ion and unprotonated oxyphosphorane
Abstract
Reaction of 2,2,2-trimethoxy-4,5-dimethyl-2,2-dihydro-1,3,2-dioxaphospholen with FSO3H in CH2Cl2 at low temperatures gives the corresponding protonated oxyphosphorane.