Methylene
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2008-05-14T05:05:07Z
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[[Image:Methylene Chloride.PNG|thumb|right|75px|[[Dichloromethane]]]]
[[Image:Methylenecyclopropene.png|thumb|right|75px|[[Methylenecyclopropene]]]]
[[Image:Carbene.png|thumb|right|75px|[[Carbene]]]]
'''Methylene''' is the chemical species, R<sub>2</sub>C:, named after [[methane]], in which two of the carbon atom's valence electrons form no bonds. The word is applicable to:
* the −CH<sub>2</sub>− group present, for example, in [[dichloromethane]] (also known as methylene chloride),
* the =CH<sub>2</sub> group, which occurs in [[methylenecyclopropene]],
* and the :CH<sub>2</sub> molecule, a [[carbene]] known as methylene. A carbene is a highly reactive [[organic molecule]] having a [[valence (chemistry)|divalent]] [[carbon]] atom with six [[valence (chemistry)|valence]] electrons.
Methylene groups in a chain or ring contribute to its size and [[lipophilicity]].
==See also==
*[[Methyl]]
*[[Methylidyne]]
[[Category:Functional groups]]
{{organic-chem-stub}}
[[de:Methylengruppe]]
[[es:Metileno]]
[[fr:Méthylène]]
[[it:Metilene]]
[[ja:メチレン基]]
[[he:מתילן]]
[[pt:Metileno]]
[[sv:Metylengrupp]]
[[zh:亚甲基]]