Kinetic Isotope Effects for Electron-Transfer Pathways in the Oxidative C−H Activation of Hydrocarbons
Journal of the American Chemical Society1998Vol. 120(12), pp. 2826–2830
Citations Over TimeTop 10% of 1998 papers
Abstract
Fast hydrogen atom transfers from various methylbenzenes (ArH) to photoactivated quinones Q* show primary kinetic isotope effects k(H)/k(D) of 2.4−5.6. The quantitative effects of added inert salt on the kinetics and on the yields of the intermediate cation radical ArH+• demonstrate that hydrogen transfer proceeds via a two-step sequence involving an initial electron transfer to form the ion-radical pair [ArH+•, Q-•] which subsequently undergoes proton transfer according to the electron-transfer mechanism in Scheme 1.
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