The reaction between silver perfluoroalkanesulfinates Cl(CF2)nSO2Ag (n = 4, 6) and iodine in dichloromethane at low temperature (e.g., -30 ? resulted in the formation of the corresponding perfluoroalkanesulfonyl iodides, which were identified by their 19F NMR spectra. The sulfonyl iodide generated in situ reacted with various olefins to form two series of adducts, namely the normal adducts, e.g. Me(CH2)3CHICH2SO2(CF2)nCl, and the adducts resulting from the simultaneous loss of the SO2 moiety, e.g. Cl2CICH2(CF2)nCl, in yields varying from moderate to good.

Key words: SULFONIC ACID P, PERFLUORO-HYDROCARBON, ACYL IODIDE