Metal-Catalyzed Oxygenation Mechanisms

Enzymes that contain metal ions at their active sites—such as cytochrome P450s and methane monooxygenase—carry out some of chemistry's most demanding transformations, selectively inserting oxygen atoms from atmospheric O₂ into otherwise unreactive bonds like the carbon–hydrogen bond of methane. Understanding how these metalloenzymes activate dioxygen requires tracking fleeting, high-valent intermediates—iron-oxo and iron-peroxo species that exist for only microseconds yet dictate the reaction's selectivity and efficiency. Researchers are working to reconstruct these mechanisms in precise chemical terms, including how electrons and protons move in concert during O₂ activation, a process known as proton-coupled electron transfer, and how synthetic non-heme iron catalysts can replicate or approximate what biology accomplishes with apparent ease. Central open questions include how protein architecture tunes the reactivity of otherwise similar metal centers, and whether the design principles extracted from metalloenzymes can be translated into practical catalysts for selective oxidation chemistry.

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Keywords

Dioxygen ActivationMetalloenzymeOxygenation ReactionsProton-Coupled Electron TransferNon-Heme Iron CatalystsCytochrome P450 Enzymes