carbenes

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 (@S05699@) or spin-non-paired (@T06503@). In @S06236@ formation, carbene is the name of the @P04405@ :CH2 hence, the name dichlorocarbene for :CCl2. However, names for acyclic and cyclic @H02889@ 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 @A00121@ C00806-2.png, @I02953@, C00806-3.png and @V06620@.
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]
See also:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1092 [Terms] [Paper]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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Last revised: February 24, 2014