Add time:08/17/2019         Source:sciencedirect.com

The acidity of Eaton's regent, methanesulfonic acid-phosphorus pentoxide, was determined by 13C NMR using mesityl oxide as indicator extrapolated to infinite dilution. It was found that addition of P2O5 decreases the strength of MeSO3H. The mixed anhydrides and the polyphosphoric acids identified by 13C- and 31P-NMR behave, therefore, as weak bases in methanesulfonic acid solution. Addition of small amounts of water produces a steep decrease in acidity of MeSO3H but has little effect on the acid strength of MeSO3H-P2O5, acid mixture. Phosphorus pentoxide is thus able to delay the deactivation by the strong base water, when this is a product of the reactions catalyzed by Eaton's catalyst.

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