Phenylpropenes broadly are compounds containing a phenyl ring bonded to propene, more specifically those with an allyl group bonded to a benzene ring, having the parent structure of allylbenzene. These comprise a class of phenylpropanoids, where there are typically other substituents bonded to the aromatic ring. Phenylpropene specifically may refer to the following isomers of C9H10 (molar mass 118.179 g/mol):
trans-Propenylbenzene (trans-1-phenylpropene) α-Methylstyrene (2-phenylpropene) Allylbenzene (3-phenylpropene)