Reactions of Phosphorylsulfenyl Chlorides with 2H-1,2,3-Diazaphospholes

Abstract

Formation of a quasiphosphonium salt in reaction of phosphorylsulfenyl chlorides with 1,2,3-diazaphospholes was established by dynamic 31P NMR spectroscopy. The salt is formed by addition of 2 mol of phosphorylsulfenyl chloride to the σ2λ3P=C endocyclic fragment by the 1,1- and 1,2-addition schemes. Decomposition of the salt yields mainly O,O-dialkyl phosphothiochloridate and, to a lesser extent, dialkyl phosphochloridate.