The rate of hydrolysis of methyl and ethyl hydrogen sulphates increases by a factor of 107 when the solvent is changed from pure water to moist dioxan. The reaction is acid-catalysed and the reaction species probably is the zwitterion R–O+H–SO2–O–. The effective strength of sulphuric acid in 98% dioxan–2% water was studied with the indicator p-nitroaniline.
B. D. Batts, J. Chem. Soc. B, 1966, 547 DOI: 10.1039/J29660000547
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