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• W2970073657 abstract "Recently selective C–H bond cleavage under mild conditions with weak oxidants was reported for fluorenyl-benzoates. This mechanism is based on multi-site concerted proton-coupled electron transfer (PCET) involving intermolecular electron transfer to an outer-sphere oxidant coupled to intramolecular proton transfer to a well-positioned proton acceptor. The electron transfer driving force depends predominantly on the oxidant, and the proton transfer driving force depends mainly on the basicity of the carboxylate, which is influenced by the substituent on the benzoate fragment. Experiments showed that the rate constants are much more sensitive to the carboxylate basicity than to the redox potential of the oxidant. Herein a vibronically nonadiabatic PCET theory is used to explain how changing the driving force for the electron and proton transfer components of the reaction through varying the oxidant and the substituent, respectively, impacts the PCET rate constant. In addition to increasing the driving force for proton transfer, enhancing the basicity of the carboxylate also decreases the equilibrium proton donor–acceptor distance, thereby facilitating the sampling of shorter proton donor–acceptor distances. This additional effect arising from the strong dependence of proton transfer on the proton donor–acceptor distance provides an explanation for the greater sensitivity of the rate constant to the carboxylate basicity than to the redox potential of the oxidant. These fundamental insights have broad implications for developing new strategies to activate C–H bonds, specifically by designing systems with shorter equilibrium proton donor–acceptor distances." @default.
• W2970073657 created "2019-09-05" @default.
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• W2970073657 date "2019-08-29" @default.
• W2970073657 modified "2023-09-27" @default.
• W2970073657 title "Strategies for Enhancing the Rate Constant of C–H Bond Cleavage by Concerted Proton-Coupled Electron Transfer" @default.
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• W2970073657 doi "https://doi.org/10.1021/jacs.9b06849" @default.
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