Allyl
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2008-02-03T11:03:36Z
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[[Image:Allyl.png|thumb|right|Chemical structure of the allyl group.]]
An '''allyl''' group is an [[alkene]] [[hydrocarbon]] group with the formula H<sub>2</sub>C=CH-CH<sub>2</sub>-. It is made up of a [[vinyl]] group, CH<sub>2</sub>=CH-, attached to a [[methylene]] -CH<sub>2</sub>. For example [[allyl alcohol]] has the structure H<sub>2</sub>C=CH-CH<sub>2</sub>OH . Compounds containing the allyl group are often referred to as being '''allylic'''.
Allylic carbons are sp³ hybridized, vinylic carbons are sp² hybridized.
The site of the saturated carbon atom, where the vinyl group attaches (e.g. next to the OH in allyl alcohol) is called the '''allylic position''' or '''allylic site'''. A group, such as -OH, attached at an allylic site is sometimes described as '''allylic'''. Two examples of simple allyl compounds are [[allyl chloride]] and [[allyl alcohol]].
Substituted versions of the above, such as the ''trans''-but-2-en-1-yl or ''crotyl'' group (CH<sub>3</sub>CH=CH-CH<sub>2</sub>-) may be also referred to as allylic groups.
Allylic methylene groups show special reactivity such as demonstrated in [[allylic oxidation]]s, [[ene reaction]]s and the [[Trost asymmetric allylic alkylation]].
== See also ==
* [[Naloxone]]
* [[Dimethylallyl pyrophosphate]]
* [[Allylic rearrangement]]
* [[Allyl alcohol]]
* [[Diallyllysergamide]]
* [[Propylene]]
* [[Isoprene]]
* [[Terpene]]
[[Category:Alkenes]]
[[Category:Functional groups]]
[[ar:أليل]]
[[de:Allyl]]
[[es:Grupo alilo]]
[[nl:Allyl]]
[[ja:アリル化合物]]
[[pl:Allil]]
[[vi:Allyl]]
[[zh:烯丙基]]