- Push-pull olefin
A push-pull olefin is a type of
olefin characterized by an electron-withdrawingsubstituent on one side of thedouble bond and an electron-donating substituent on the other side. This makes thepi bond very polarized. Therotational barrier for a push-pull olefin is lower than that of an ordinaryolefin and this makes it an interesting candidate for amolecular switch for instanceazobenzene s. A push-pull configuration also helps to stabilize double bond because the carbon carbon bond has considerable less double bond character. For instancecyclobutadiene is a very unstable molecule but with both olefinic bonds in push-pull configuration (twoester substituents and twotertiary amine substituents) the molecule is stable indeed.References
* "Ethyl (2-cyano-3-ethoxyacryloyl)carbamate: irreversible thermal isomerization of a push-pull olefin" Kuangsen Sung, Ming-Chi Lin, Pin-Mei Huang, Bo-Ren Zhuang, Robert Sung,Ru-Rong Wu
Arkivoc 2005 p.131 [http://arkat-usa.org/ark/journal/2005/I13_General/1380/05-1380D.asp]open access publicationee also
*
Leimgruber-Batcho indole synthesis
* Application of push-pull olefins inmolecular logic gate s
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