Nitrosyl Triflate and Nitrous Anhydride, Same Mode of Generation, but Very Different Reaction Pathways. Direct Synthesis of 1,2-Oxazetes, Nitroso or Bisoxazo Compounds from Olefins.

Nitrosyl triflate (TfONO) can be generated from tetra--butylammonium nitrite and triflic anhydride (1:1) in CHCl solution at ca. -30 °C. It acts as a powerful and soluble nitrosating agent with a wide range of olefinic or aromatic substrates.