Reactivity of perfluoroalkenylmagnesium halides : Application to the synthesis of new α-β unsaturated polyfluorinated alcohols and organometallic compounds

Abstract

Abstract The reactivity of perfluoroalkenylmagnesium bromides R F CFCFMgBr (R F C 4 F 9 , C 6 F 13 ), obtained from the corresponding l-bromo-perfluoroalkenes, has been investigated. These Grignard reagents react with carbonyl compounds to give, with good yields, a series of new α-β unsaturated polyfluorinated alcohols R F CFCFC(OH)RR′ (1). The synthesis and spectrographic characteristics of these compounds are reported and discussed. Perfluoroalkenyl mercuric and tin derivatives are obtained from the reaction of the perfluorinated Grignard reagents with mercuric salts and organotin halides respectively : Spectroscopic identification and some chemical properties of these new perfluorinated organometallic compounds are given. The good reactivity of these unsaturated derivatives towards protic acids and electrophiles, leading to the cleavage of the perfluoroalkenyl group, is used to study the possibilities of transmetallation reactions. Somes examples of these reactions are reported.