Carbenoid Chemistry in Organic Synthesis

Carbenoid chemistry encompasses the use of metal–carbon species that mimic the reactivity of free carbenes while offering enhanced stability and selectivity. These ambiphilic intermediates—typically derived from diazo compounds or carbenoid-generating reagents in the presence of transition metals or main-group metals—enable a range of transformations, most notably cyclopropanation and homologation. In cyclopropanation, a carbenoid adds across an alkene to furnish three-membered rings with high stereospecificity. In homologation processes, a single-carbon unit is inserted into existing bonds, allowing precise extension of carbon frameworks and the introduction of functionalised methylene fragments. Over recent decades, advances in ligand design, flow-chemistry reactors and chiral catalysts have greatly improved control over carbenoid reactivity and stereocontrol. Stabilisation strategies—such as chelation of the metal centre and fine tuning of electronic properties—have broadened substrate scope, reduced side reactions and enabled late-stage functionalisation of complex molecules. The global significance of carbenoid chemistry is evident in its applications to natural product synthesis, medicinal chemistry and the manufacture of agrochemicals, where efficient, selective carbon-unit transfers reduce step counts and enhance overall process sustainability.

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Carbenoid Chemistry in Organic Synthesis publication trend

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Technical terms

Carbenoid: A metal-stabilised species that exhibits carbene-like reactivity, used for concerted addition and insertion reactions.

Cyclopropanation: Formation of a three-membered carbocycle by addition of a carbenoid to an alkene, often delivering high stereospecificity.

Homologation: The insertion of a defined carbon unit into a molecule’s framework, extending its chain by one or more methylene groups.

α-Diazo carbonyl compound: A molecule bearing a diazo group adjacent to a carbonyl, serving as a precursor to metal–carbene or carbenoid intermediates under catalytic conditions.

References

1. Base-mediated homologative rearrangement of nitrogen–oxygen bonds of N -methyl- N -oxyamides. Chemical Science (2023).
2. The Versatility of the Roskamp Homologation in Synthesis. Molecules (2025).
3. Stability and reactivity control of carbenoids: recent advances and perspectives. Chemical Communications (2016).