The N-nitration of secondary amines under neutral conditions poses a unique problem of N- nitrosation as a competing side reaction. When nitrogen dioxide, l nitryl chloride,* nitrogen pentoxide, nitryl fluoride, nitronium flu~ roborate,~ and tetranitromethane* are used in the N- nitration of amines, they all result in substantial yields (230%) of nitrosamine side products, which are extremely toxic and difficult to separate from the target nitramines. Nitramines ...