Eaton's reagent explained

Eaton's reagent[1] (10 wt% phosphorus pentoxide solution in methanesulfonic acid) is used as an alternative to polyphosphoric acid in chemical synthesis to promote acylation reactions.

References

  1. 10.1021/jo00987a028 . Eaton, P. E. . Carlson, G. R. . Lee, J. T. . Phosphorus pentoxide-methanesulfonic acid. Convenient alternative to polyphosphoric acid . . 1973 . 38 . 23 . 4071.