A study of ion–molecule reactions in the gas phase. Part 3. The reactions of methyl and fluoromethyl cations with alkenes and fluoroalkenes in the gas phase

Abstract

The reactions of CH₃⁺, CH₂F⁺, CHF₂⁺, and CF₃⁺ with ethene, fluoro-, 1,1-difluoro-, trifluoro-, and tetrafluoro-ethene and with propene, but-1-ene, but-2-ene, and 2-methylpropene have been studied in the gas phase. As well as simple charge exchange, addition reactions were observed in which the initial adduct broke down to yield neutral fragments and ions of either general formula (C_nX_2n+1)⁺ or (C_nX_2n–1)⁺, where X = H and/or F. The fragmentation of the initial transient adduct ion was often associated with hydrogen atom and/or fluorine atom migration.