Reactions of Sulphonic and Selenonic Acids

A useful practical study has shown that arenesulphonic acids can be extracted from aqueous solutions into immiscible organic solvents as ion-pairs with amines. 

The propensity for selenonic acids to react as oxidizing agents has been known for a long time, but this has been regarded more as an interesting contrast between 

Buerger, F. Heyder, G. Pawelke, and H. Niederprum,/. Fluorine Chem., 1979, 13,251. 

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