A new preparation of peroxydisulfuryl difluoride

A NEW PREPARATION OF PEROXYDISULFURYL DIFLUORIDE S.D. Brown and G.L. Gard Department of Chemistry Portland State University Portland, Oregon 97207 ~ece~ed27Au~st1974) Cady and Dudley (i) first reported the preparation of peroxydisulfuryl difluoride ($206F2) via the catalytic fluorination of SO 3 with F 2 over AgF 2 at i00 °. More recently it was shown that XeF 2 will react with SO 3 to form $206F 2 (2). We now wish to report another route to $206F 2. Chromium pentafluoride reacts quantitatively with SO 3 according to the following equation: CrF 5 + 5S03 ) $206F 2 + Cr(SO3F) 3 Pure $206F 2 is removed from the reaction mixture at -22 ° . Cr(SO3F)3, which has not been previously reported, is an amorphous light green solid soluble in DMSO. The infrared spectrum was measured neat between KRS5 windows and is listed along with its assignments in Table I. TABLE I Infrared Spectra of Cr(SO3F) 3 Band (cm -I) Approximate Assignment