Eaton's reagent

{{Short description|Chemical compound}}

{{Expand German}}

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| ImageFileL1 = Phosphorus-pentoxide-3D-balls.png

|ImageFileR1=Methanesulfonic-acid-3D-balls.png

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| OtherNames = Phosphorus pentoxide-methanesulfonic acid

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{{Chembox Identifiers

| CASNo = 39394-84-8

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| EINECS = 679-375-3

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{{Chembox Properties

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| Solubility = hydrolyzes}}

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Eaton's reagent{{cite journal | doi = 10.1021/jo00987a028 |author1=Eaton, P. E. |author2=Carlson, G. R. |author3=Lee, J. T. | title = Phosphorus pentoxide-methanesulfonic acid. Convenient alternative to polyphosphoric acid | journal = J. Org. Chem. | year = 1973 | volume = 38 | issue = 23 | pages = 4071}} (10 wt% phosphorus pentoxide solution in methanesulfonic acid) is used as an alternative to polyphosphoric acid in chemical synthesis to promote acylation reactions.