Radical Photochemical Reactions

Radical photochemical reactions use light to trigger the transfer of single electrons through carefully chosen catalysts—often transition metal complexes—generating highly reactive radical intermediates that can form chemical bonds difficult or impossible to build by conventional means. By harnessing visible light instead of harsh reagents or extreme conditions, chemists can functionalize carbon–hydrogen bonds directly, perform arylation reactions, and access molecular scaffolds relevant to pharmaceuticals and materials with far greater efficiency and selectivity. Electrochemical methods are increasingly paired with photocatalysis, blurring the boundary between light-driven and current-driven synthesis in ways that expand the toolkit available for constructing complex molecules. Active questions include how to design catalysts that control radical reactivity with high precision, how to predict and exploit the behavior of nitrogen-centered radicals, and how to translate these laboratory-scale reactions into practical, scalable processes.

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Keywords

Visible Light Photoredox CatalysisOrganic SynthesisElectrochemical MethodsTransition Metal ComplexesRadical ReactionsC–H Functionalization