In organic chemistry, 1-propenyl (or simply propenyl) has the formula CH=CHCH3 and 2-propenyl (isopropenyl) has the formula CH2=C-CH3. These groups are found in many compounds. Propenyl compounds are isomeric with allyl compounds, which have the formula CH2-CH=CH2. Chemicals with 1-propenyl groups 2-chloropropylene propenylbenzene (β-methylstyrene). Many phenylpropanoids and their derivatives feature derivatives of propenylbenzene: Anethole Asarone Carpacin Coniferyl alcohol Isoeugenol Isosafrole Methyl isoeugenol Pseudoisoeugenol Chemicals with 2-propenyl groups Several terpenes feature 2-propenyl substituents: carvone limonene See also Propene Functional group References Alkenyl groups