{{Short description|Free radical}} In organic chemistry, '''1-propenyl''' (or simply '''propenyl''') has the formula '''·'''CH=CH–CH<sub>3</sub> and '''2-propenyl''' ('''isopropenyl''') has the formula CH<sub>2</sub>=(C'''·''')–CH<sub>3</sub>. These groups are found in many compounds. Propenyl compounds are isomeric with allyl compounds, which have the formula '''·'''CH<sub>2</sub>–CH=CH<sub>2</sub>.
[[Image:Monolignols general.svg|thumb|200px|The three common precursors to lignin are derivatives of propenylbenzene: paracoumaryl alcohol (1), coniferyl alcohol (2) and sinapyl alcohol (3).]]
==Chemicals with 1-propenyl groups== *2-chloropropylene *propenylbenzene (β-methylstyrene).<ref>{{cite journal|title=Preparation of Alkenes by Reaction of Lithium Dipropenylcuprates with Alkyl Halides: (E)-2-Undecene|first1=Gerard|last1=Linstrumelle|first2= Jeanne K.|last2=Krieger|first3=George M.|last3=Whitesides |journal=Org. Synth.|year=1976|volume= 55|page=103|doi=10.15227/orgsyn.055.0103|url=http://www.orgsyn.org/Content/pdfs/procedures/v55p0103.pdf}}</ref> Many phenylpropanoids and their derivatives feature derivatives of propenylbenzene: *Anethole *Asarone *Carpacin *Coniferyl alcohol *Isoeugenol *Isosafrole *Methyl isoeugenol *Pseudoisoeugenol
==Chemicals with 2-propenyl groups== [[File:P-isopropenylphenol.svg|thumb|left|100px|''p''-Isopropenylphenol features a 2-propenyl derivative of phenol.]] Isopropenyl acetate is a 2-propenyl ester, synthesizable from ketene.
Several terpenes feature 2-propenyl substituents: *carvone *limonene
==See also== * Propene * Functional group
==References== <references />
{{organic-chem-stub}}{{Functional groups}} Category:Alkenyl groups