Abstract
N-(Diphenylphosphinothioyl)hydroxylamine 5 has been prepared from Ph2P(S)Cl using H2NOSiMe3 and has been converted into its O-benzoyl derivative Ph2P(S)NHOCOPh 6. The principal reaction of the derivative 6 with base (NaOMe or ButNH2) is rearrangement, transposition of sulfur and oxygen giving Ph2P(O)NHSCOPh 7; this then reacts further, forming the phosphinic amide Ph2P(O)NH2 together with PhCO2Me or PhCONHBut. The rearrangement probably involves intramolecular nucleophilic displacement of benzoate by the PS group of 6, forming an intermediate with P, N and S atoms in a three-membered ring.
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