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An allyl group is an alkene hydrocarbon group with the formula H2C=CH-CH2-. It is made up of a vinyl group, CH2=CH-, attached to a methylene -CH2. For example allyl alcohol has the structure H2C=CH-CH2OH . 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 (CH3CH=CH-CH2-) may be also referred to as allylic groups.

Allylic methylene groups show special reactivity such as demonstrated in allylic oxidations, ene reactions and the Trost asymmetric allylic alkylation.