Persulfuric acid or peroxycarboxylic acids have been successfully employed4 for the oxidation of aromatic amines to nitroso compounds. Performic acid has been reported5 to be useful for the oxidation of pentafluoroaniline to pentafluoronitrosobenzene (I). We used this procedure to prepare I in 46.6% yield. The product, which is monomeric in the crystalline as well as the liquid or dissolved state, was obtained as blue crystals and was characterized ...
