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What (who) is divalent$22330$ - definition
![Methylene]] is the simplest carbene.](https://commons.wikimedia.org/wiki/Special:FilePath/Carbene.svg?width=200 "Methylene]] is the simplest carbene.")
Wikipedia
In organic chemistry, a carbene is a molecule containing a neutral carbon atom with a valence of two and two unshared valence electrons. The general formula is R−:C−R' or R=C: where the R represents substituents or hydrogen atoms.
The term "carbene" may also refer to the specific compound :CH2, also called methylene, the parent hydride from which all other carbene compounds are formally derived. Carbenes are classified as either singlets or triplets, depending upon their electronic structure. Most carbenes are very short lived, although persistent carbenes are known. One well-studied carbene is dichlorocarbene Cl2C:, which can be generated in situ from chloroform and a strong base.
