View source for Allyl


==Overview==
[[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 sp<sup>3</sup> hybridized, vinylic carbons are sp<sup>2</sup> 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]]
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[[ar:أليل]]
[[de:Allyl]]
[[es:Grupo alilo]]
[[ja:アリル化合物]]
[[pl:Allil]]
[[vi:Allyl]]

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