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- W2021609085 abstract "Abstract Ion-molecule reactions have been studied in which a substituted methyl or ethyl carbonium ion reacts with a halogenated methane or ethane by halide ion abstraction to give another carbonium ion. The thermochemical control of these reactions has been interpreted in terms of a quantity, the halide affinity, which is a measure of the Lewis acidity of the carbonium ions. By studying competitive fluoride and chloride transfer reactions the relative ordering of fluoride affinities (CH 3 + ⩾ CF 3 + ⩾ CHF 2 + ⩾ CH 2 F + ⩾ CHFCl + ⩾ CH 3 CF 2 + ⩾ CH 3 CHF + ⩾ CH 3 CH 2 + ) and chloride affinities (CF 3 + ⩾ CHF 2 + ⩾ CH 2 CL + ⩾ CF 2 Cl + ⩾ CHFCl + ⩾ CHCl 2 + ) has been established. These orders are compared with values derived from available thermochemical data and used to establish new limits on ionic heats of formation. A qualitative discussion of relative Lewis acidity in terms of electronegativity, π-back donation, and polarizability of the substitutents is presented." @default.
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- W2021609085 date "1973-03-01" @default.
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- W2021609085 title "I. Halide ion transfer reactions in the gas phase ion chemistry of haloalkanes" @default.
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- W2021609085 doi "https://doi.org/10.1016/0020-7381(73)80057-9" @default.
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