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Recent advances in combining photo- and N-heterocyclic carbene catalysis

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CHEMICAL SCIENCE
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ROYAL SOC CHEMISTRY
DOI: 10.1039/d3sc03274d

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N-Heterocyclic carbenes (NHCs) are Lewis basic catalysts that can mediate organic transformations through polarity reversal. Recent advances have combined NHC catalysis with photoredox catalysis to enable NHC-mediated radical reactions under mild conditions. This review focuses on elucidating the mechanisms and exploring the opportunities and challenges of combining photoredox and NHC catalysis.
N-Heterocyclic carbenes (NHCs) are unique Lewis basic catalysts that mediate various organic transformations by means of polarity reversal. Although the scope of research on two-electron reactions mediated by NHC catalysts has been expanding, the types of these reactions are limited by the inability of NHCs to engage sp3-electrophiles. However, the revival of photocatalysis has accelerated the development of free-radical chemistry, and combining photoredox catalysis and NHC catalysis to achieve NHC-mediated radical reactions under mild conditions could overcome the above-mentioned limitation. This review summarizes recent advances in combining photoredox and NHC catalysis, focusing on elucidation and exploration of mechanisms, with the aim of identifying challenges and opportunities to develop more types of catalytic models. This review summarizes recent advances in combining photo- and N-heterocyclic carbene catalysis, as well as provides an outlook on future opportunities and challenges.

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