The reaction of pentafluoro-lambda (6)-sulfanyl(SF5)-perfluoroalkyl iodides with benzene is a convenient route for preparing SF5-perfluoroalkyl benzene derivatives, SF5(CF2)(n)C6H5 (n = 2, 4, 6, 8), a new class of perfluoroalkylaromatic compounds. The preparation and characterization of these new materials are described. (C) 2001 Elsevier Science B.V. All rights reserved.