Concerted proton-electron transfer oxidation of phenols and hydrocarbons by a high-valent nickel complex.

ABSTRACT: The high-valent nickel(iii) complex Ni(pyalk)₂ ⁺ (2) was prepared by oxidation of a nickel(ii) complex, Ni(pyalk)₂ (1) (pyalk = 2-pyridyl-2-propanoate). 2 and derivatives were fully characterized by mass spectrometry and X-ray crystallography. Electron paramagnetic resonance spectroscopy and X-ray photoelectron spectroscopy confirm that the oxidation is metal-centered. 2 was found to react with a variety of phenolic and hydrocarbon substrates. A linear correlation between the measured rate constant and the substrate bond dissociation enthalpy (BDE) was found for both phenolic and hydrocarbon substrates. Large H/D kinetic isotope effects were also observed for both sets of substrates. These results suggest that 2 reacts thr

SUBMITTER: Fisher KJ 

PROVIDER: S-EPMC7069233 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature