Radical Photochemical Reactions

Radical photochemical reactions use light to generate highly reactive, short-lived intermediates called radicals, which can then be directed to form new chemical bonds in ways that conventional thermal methods struggle to achieve. A central tool in this area is photoredox catalysis, where transition metal complexes or organic dyes absorb visible light and shuttle electrons to or from substrate molecules, triggering radical processes with remarkable selectivity under mild conditions. This approach has opened practical routes to C–H functionalization—directly converting inert carbon-hydrogen bonds into more complex structures—reducing the number of synthetic steps needed to build pharmaceuticals, agrochemicals, and functional materials. Active research is now pushing toward merging photoredox with electrochemical methods to give chemists finer control over reaction driving forces, and toward understanding how nitrogen-centered radicals can be harnessed for selective bond formation in densely functionalized molecules.

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Keywords

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