Abstract

Peroxodisulphuryl difluoride, (FSO3)2, generated by constant-current electrolysis of fluorosulphuric acid–potassium fluorosulphate (1.0M), reacts rapidly and smoothly with a series of carboxylic acids (C3–C10) in fluorosulphuric acid at 273 K. Oxidation occurs at a site remote from the carboxy-group and, after work-up, lactones can be isolated in high yields.

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