Alternatives to iridium : a polyaza[7]helicene as a strongly reductive visible light photoredox catalyst
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Abstract
The use of a readily accessible polyazahelicene as a strongly reducing metal-free alternative to the commonly used precious metal based photoredox catalysts is demonstrated. An improved two-step synthesis of the catalyst is described, and its photophysical properties with respect to its use as a photoredox catalyst are evaluated. Its activity under visible light irradiation is proven by application in two double radical light-driven multicomponent reactions. The azahelicene gave comparable results to an iridium-based catalyst originally used for the same transformations.
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ACS organic & inorganic Au, 2, 5, American Chemical Society, Washington, DC, 2022, https://doi.org/10.1021/acsorginorgau.2c00022