Abstract
The proton affinity (PA) of triethylsilanol has been determined by equilibrium proton transfer measurements using a high pressure mass spectrometer. The reference bases were naphthalene and m-xylene which have the required low affinities for trialkylsilylium. van't Hoff plots were used to obtain PA((C2H5)3SiOH) = 197.9 ± 0.4 kcal mol−1•This value is used to recommend that. PA((CH3)3SiOH) ≈ 192 kcal mol−1•(C2H5)3Si+ has been produced by the protonation of (C2H5)4Si and the enthalpy change for the reaction [Formula: see text] has been determined to be 32 ± 1 kcal mol−1 which gives [Formula: see text]((C2H5)3Si+) = 135 kcal mol−1•A value of ~ 141 kcal mol−1 is recommended for [Formula: see text].
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