Fluorosulfates peroxydisulfuryl difluoride

Peroxydisulfuryl difluoride [13709-32-5] FSO2OOSO2F, prepared from fluorine and SO (87), is a ready source of fluorosulfate radicals, FSO2O , (88) which react with many substances to form stable fluorosulfates (89,90). By using the route... 

Marteau and G.H. Cady, The Reaction of Peroxydisulfuryl Difluoride with Anhydrides of Certain Perhalocarboxylic Acids to Form Per-haloacyl Fluorosulfates , Univ Wash, Seattle,... 

Peroxydisulfuryl difluoride See Tetra(boron nitride) fluorosulfate... 

Fokin AV, Studnev Yu N (1984) Some Aspects of the Use of Peroxydisulfuryl Difluoride and Halogen Fluorosulfates in Organic Synthesis. In ibid p 47... 

Peroxydisulfuryl difluoride can be prepared by reaction of fluorine with an excess of sulfur trioxide at about 250° and by the combination of fluorine fluorosulfate with sulfur trioxide. The catalytic fluorination of sulfur trioxide vapor by fluorine in the presence of a heated catalyst of copper ribbon coated with silver(II) fluoride provides a good method for the preparation of a product which can be purified easily. 

Whilst medium-chain-length carboxylic acids (six or more carbon atoms) can be directly oxidized in anhydrous fluorosulfuric acid containing potassium fluorosulfate, those of lower molecular weight are not oxidized before the oxidation of the fluorosulfate anion. For their conversion, solutions of peroxydisulfuryl difluoride, which is known to react also with short-chain alkanes " , are prepared by constant-current electrolysis of potassium fluorosulfate and added to the carboxylic acids in fluorosulfonic acid, y- and -Lactones are obtained in yields between 7 and 50% (equation 19) . 

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