Allylbenzene or 3-phenylpropene is an organic compound with the formula C6H5CH2CH=CH2.

The compound consists of a phenyl group attached to an allyl group.

Allylbenzene isomerizes to trans-propenylbenzene.

[3] In plant biochemistry, the allylbenzene skeleton is the parent (simplest representation) of many phenylpropanoids.

Prominent allylbenzenes include eugenol, safrole, and many others.