Although peroxydisulphuryldifluoride was first prepared a number of years ago', its potential as a reagent in synthesis has not previously been realised and, indeed, the only 2 reactions which have been reported are those in the vapour phase with perfluoroolefins. In this paper we describe some reactions between peroxydisulphuryldifluoride and some saturated organic molecules, namely methane, acetic acid, propionic acid and acetone, in ...