Recent Advance in Single Nickel Photocatalysis for Carbon‐Heteroatom Bond Formation

Variant nickel precatalysts converted into nickel(III) or excited state nickel(II) complexes for facile reduction elimination to access carbon-heteroatom couplings under visible-light irradiation are discussed in detail.

Abstract

The widely used nickel catalysis for carbon-heteroatom cross-coupling reactions often requires high energy to achieve reductive elimination on Ni^II complexes. To overcome the energy barrier of reductive elimination, the Ni^II complexes often transform to Ni^III facile reductive elimination via single electron transfer in photochemistry. Energy transfer to form the excited-state Ni^II complexes is feasible as well for carbon-heteroatom couplings in nickel catalysis. This Review is focused on the discussion about the variant nickel(II) complexes as the precatalysts to forge diverse carbon-heteroatom bonds under visible-light irradiation in the absence of exogenous photocatalysts. Summary of photoactive nickel catalysis aims to promote the development of cheap, abundant metals catalyzed carbon-heteroatom couplings for efficient preparation of highly valuable chemicals.

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