As an ideal alternative to traditional precious metal catalysts,iron has the advantages of wide sources,low toxicity,and good environmental compatibility,and is currently used in various en-vironmentally friendly catalytic processes.In recent years,N-heterocyclic carbene(NHC)has been widely used as a ligand not only in the catalysis of precious metals(such as palladium,nickel,rhodi-um,etc.)but also in iron catalysis due to its unique spatial and electronic properties.This article re-views the characteristics of NHC-Fe catalysts and focuses on the research progress in carbon-carbon coupling reactions catalyzed by NHC-Fe complexes in the past decade,including aryl-aryl cross-cou-pling,aryl-alkyl cross-coupling,alkyl-alkyl cross-coupling,and others.
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