Abstract
AbstractThe gas‐phase interaction of protonated acetone and tert‐butyl cations with 1,3,5‐cycloheptatriene was studied by Fourier transform ion cyclotron resonance (FT‐ICR) mass spectrometry. In addition to proton transfer giving C7H9+ ions, hydride abstraction from cycloheptatriene giving C7H7+ ions was observed. Deuterium labeling experiments combined with the determination of the reaction kinetics excluded the formation of C7H7+ ions by consecutive proton transfer and H2 expulsion under these conditions. The kinetic isotope effect measured for the hydride transfer channel was found to be in the range 1.65±0.1, very close to that known to operate during hydride transfer from simple alkylbenzenes to t‐C4H9+ ions. Copyright © 2003 John Wiley & Sons, Ltd.
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