https://doi.org/10.1351/goldbook.C00806
The electrically neutral species H2C: and its derivatives, in which the carbon is covalently bonded to two univalent groups of any kind or a divalent group and bears two nonbonding electrons, which may be spin-paired (@[email protected]) or spin-non-paired (@[email protected]). In @[email protected] formation, carbene is the name of the @[email protected] :CH2 hence, the name dichlorocarbene for :CCl2. However, names for acyclic and cyclic @[email protected] containing one or more divalent carbon atoms are derived from the name of the corresponding all-\(\lambda ^{4}\)-hydrocarbon using the suffix -ylidene. E.g. prop-2-en-1-ylidene, H2C=CHCH: ethenylidene, H2C=C:; cyclohexylidene,
C00806-1.png

Subclasses of carbenes include @[email protected] C00806-2.png, @[email protected], C00806-3.png and @[email protected]
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1324 [Terms] [Paper]