Propenyl
In organic chemistry, propenyl is the species with the formula CH=CHCH3. Many propenyl compounds are known, such as cis- and trans-1-chloropropene, propenylbenzene (β-methylstyrene). Propenyl compounds are isomeric with and less common than allyl compounds.
See also
References
http://www.biology-online.org/dictionary/Propenyl
http://www.thefreedictionary.com/Propenyl