CHEMISTRY LETTERS, pp. 623-626, 1985. 1985 The Chemical Society of Japan THE OXIDATION OF HYDROXYLAMINE BY FREMY'S SALT. PREPARATION OF N-NITROSAMINES AND TETRAZENES MP VAZQUEZ TATO, Luis CASTEDO, and Ricardo RIGUERA* Departamento de Química Orgánica de la Facultad de Química y Sección de Alcaloides del CSIC. Santiago, Spain Treatment of secondary amines with Fremy's salt in aqueous sodium carbonate solution and in the presence of ...