Fluoro-functionalization mediated by the reactive chalcogen reagents

Two types of fluoro-functionalizations mediated by reactive chalcogen reage nts have been summarized. The first is a generation of benzeneselenenyl flu oride and its electrophilic reactions with alkenes, electron-deficient alke nes, isonitriles and alpha-diazocarbonyl compounds. The second is a single electron transfer (SET) reaction of benzene chalcogenolates to perfluoroalk yl halides such as trifluoromethyl bromide, dibromodifluoromethane, bromodi fluoroacetates etc., where perfluorinated alkyl radicals generated in the S ET reaction undergo addition to alkenes and alkynes to give perfluoroalkyl- chalcogenated molecules. (C) 2000 Elsevier Science S.A. All rights reserved .