1991 年 39 巻 10 号 p. 2718-2720
The acidity function (H0) of mixtures of trifluoromethanesulfonic acid (TFSA) and trifluoroacetic acid (TFA) was measured. Nonaqueous acid systems based on TFSA, which is distillable, stable, non-oxidative and only weakly nucleophilic, can cover a wide range of acidity comparable to that of aqueous sulfuric acid, and should be useful for mechanistic and synthetic studies in organic chemistry. An H0 value lower than-16 could be obtained by adding a small amount of SbF5 to TFSA.