*2-chloropropylene
*propenylbenzene (β-methylstyrene).  
Many phenylpropanoids and their derivatives feature derivatives of propenylbenzene:
*Anethole
*Asarone
*Carpacin
*Coniferyl alcohol
*Isoeugenol
*Isosafrole
*Methyl isoeugenol
*Pseudoisoeugenol