All articles of this category Nitric acid/trifluoromethanesulfonic (triflic) anhydride was shown to be a highly effective electrophilic nitrating agent. A series of aromatics were nitrated under mild conditions in high yields. Similar results were also obtained when using nitric acid/trifluoromethane-sulfonic acid/phosphorus pentoxide as nitrating agent in nitroethane or nitromethane solution. The 15 N NMR spectrum of 15 N enriched nitric acid in triflic anhydride was studied and compared with that of other nitrating reagents. The data indicate the predominantly covalent nature of trifluoromethanesulfonyl nitrate formed in the systems.
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Olah et al. (1992) studied this question.