The reactions of C10S02F, BrOS02F, and C10S02CFl with SF, have been investigated. It has been found that the reactions proceed to form either trifluorosulfonium salts or covalent adducts. In the cases where the hypochlorites were used, the unusual cation SF4Cl+ can be postulated as a reactive intermediate. Characterizations of the new compounds SF3+ FS03-, SF3+ CF3S03-, cis-SF4 (C1) OS02F, trans-SF4 (CI) OS02F, and trans-SF4 (C1) OS02CF3 ...