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Cumene oxidation by cis-[RuIV(bpy)2(py)(O)]2+, revisited
Jasmine R Bryant1, Takashi Matsuo, James M Mayer
1Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USA.
Ruthenium oxo complexes oxidize cumene via hydrogen atom transfer, not hydride transfer. This study clarifies the oxidation mechanism and products, challenging previous findings.
Area of Science:
- Inorganic Chemistry
- Oxidation Mechanisms
- Organometallic Chemistry
Background:
- Ruthenium complexes are versatile oxidants in organic synthesis.
- The oxidation of hydrocarbons by high-valent metal oxo species is mechanistically complex.
- Previous studies proposed a hydride transfer mechanism for cis-[RuIV(bpy)2(py)(O)]2+ oxidation of cumene.
Purpose of the Study:
- To elucidate the oxidation mechanism of cumene by cis-[RuIV(bpy)2(py)(O)]2+.
- To investigate the role of nucleophiles in the reaction rate.
- To determine the primary products and reaction pathway.
Main Methods:
- Spectroscopic analysis of reaction products.
- Kinetic studies monitoring reaction rates.
- Correlation of reaction rates with C-H bond strengths.
Main Results:
- Cumene is oxidized to cumyl alcohol, alpha-methylstyrene, and acetophenone.
- Reaction rates are not accelerated by nucleophiles, refuting a hydride transfer mechanism.
- Evidence supports an initial hydrogen atom transfer from cumene to the ruthenium oxo group.
- Acetophenone formation is attributed to a decarbonylation pathway.
Conclusions:
- The oxidation mechanism proceeds via hydrogen atom transfer, not hydride transfer.
- The proposed mechanism is consistent with kinetic data and observed products.
- The study provides a revised understanding of ruthenium-mediated hydrocarbon oxidation.
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