A species with a neutral divalent carbon bearing two nonbonding electrons. Singlet and triplet states differ in their bonding and reaction pathways.
An alkylidene complex with substantial nucleophilic/dianionic carbene character, commonly involving an early high-oxidation-state metal and strongly donating ancillary ligands.
A metal carbene with substantial electrophilic character at carbon, commonly stabilized by a heteroatom substituent and attached to a low-oxidation-state metal carrying pi-acceptor ligands.
A carbene centre in a nitrogen-containing heterocycle, often used as a strong sigma-donor ligand. Steric substitution on nitrogen controls access to a coordinated metal.
A species that transfers carbene-like bonding reactivity without requiring an isolated free carbene. Its reaction depends on its metal or other associated group as well as its substituents.
A metal-associated carbene-like reactive centre. Loss of nitrogen from a diazo precursor can generate a centre capable of alkene cyclopropanation; the catalyst and substituents influence its selectivity.
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