Allyl 772827 188778949 2008-02-03T11:03:36Z Puppy8800 5404759 [[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]]