Abstract
The proton affinity of trimethyl borate was determined to be 197 ± 3 kcal mol −1 by bracketing in both directions in a Fourier-transform ion cyclotron resonance mass spectrometer. This value was used to calculate a heat of formation of −46.3 ± 3.0 kcal mol −1 for CH 3O(H)B(OCH 3) + 2. Collision-induced dissociation threshold energy measurements carried out in a flowing afterglow-triple quadrupole instrument yield an activation energy of 39.5 ± 3.5 kcal mol −1 for the dissociation of CH 3O(H)B(OCH 3) + 2 to CH 3OH and CH 3O) 2B +. This bond dissociation energy, together with the heat of formation of CH 3O(H)B(OCH 3) + 2, was used to calculate a heat of formation of 41.4±4.6 kcal mol −1 for (CH 3O) 2B +.
Published Version
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