Rearrangement reactions of N-phosphinoyl-O-sulfonylhydroxylamines with amines: detection of a phosphonamidic–sulfonic mixed anhydride intermediate by nuclear magnetic resonance spectroscopy
Abstract
An intermediate can be detected by 31P NMR spectroscopy when PhRP(O)NHOSO2Me( R = PhMeCH) forms the rearrangement product RP(O)(NHBut)NHPh with ButNH2 in dilute solution; the intermediate has been identified as the mixed anhydride RP(O)(OSO2Me)NHPh by comparison with an authentic sample.