Aerobic Oxidation Strategies in Organic Synthesis

Molecular oxygen has emerged as a prime oxidant in modern organic chemistry due to its abundance, low cost and environmental benignity. Aerobic oxidation encompasses a wide range of transformations in which O₂ is directly employed to introduce or manipulate oxygen-containing functional groups. The principal challenge lies in the activation of the inert O–O bond and in controlling selectivity between radical and ionic pathways. Contemporary strategies span transition-metal catalysis—where metals such as palladium, copper or cerium mediate single-electron transfer and peroxy intermediate formation—organocatalytic approaches that leverage small-molecule promoters to shuttle electrons, photochemical systems that exploit light to generate reactive oxygen species, and biocatalytic or bioinspired systems that mimic enzymatic dioxygen activation. Mechanistic frameworks often involve radical chain processes or metal-oxo species, leading to alcohols, ketones, lactones and epoxides under mild conditions. Recent innovations address the low solubility of O₂ in organic media through solvent engineering or gas–liquid interfaces, and enhance atom economy by minimising stoichiometric co-oxidants. Applications extend from fine chemical synthesis and pharmaceutical scaffolds to long-chain polymer oxidation and biomass conversion. By integrating green-chemistry principles with high catalytic efficiency, aerobic oxidation continues to redefine sustainable pathways for constructing valuable molecular architectures.

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Aerobic Oxidation Strategies in Organic Synthesis publication trend

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Technical terms

Aerobic oxidation: An oxidation process that uses molecular oxygen (O₂) as the oxidant.

Dioxygen activation: The process by which O₂ is rendered reactive, often via coordination to a catalyst or photoexcitation.

Radical chain mechanism: A sequence of reactions in which radical intermediates propagate a reaction cycle, enabling substrate turnover.

Umpolung: A reversal of normal polarity in organic substrates, allowing unconventional bond-forming reactions.

Enantioselective oxidation: An oxidation that generates chiral products with a preference for one enantiomer.

References

1. Aerobic Oxidations in Asymmetric Synthesis: Catalytic Strategies and Recent Developments. Frontiers in Chemistry (2021).
2. Mechanistic Insights into the Formation of δ‐Lactones by Cerium‐Catalyzed Aerobic Coupling of β‐Oxoesters with Enol Acetates. European Journal of Organic Chemistry (2021).