0 any gas in a group that contains carbon and hydrogen atoms, with the carbon atoms joined together in a double bond: --
Ethene and propene are alkenes.
1 any of a group of substances that contain only the elements carbon and hydrogen, which are held together by a chemical bond in which two atoms share two pairs of electrons --
A related effect is the alkene cis effect.
This process is believed to occur through direct attack of the distal bond on the coordinated alkene.
The first reaction step involves 1,4-addition of the catalytic tertiary amine to the activated alkene to generate the zwitterionic aza-enolate.
Hydroformylation, also known as oxo synthesis, is the reaction of an alkene with carbon monoxide and hydrogen.
Dimethylamine addition opened the thiolactone ring with an exocyclic alkene group in 60 by elimination of the sulfide anion from the methyl group.
In contrast, unactivated styrene reacts instead at the alkene alone via a linear polymerization reaction.
The carbon radical starts polymer chain formation with monomer for instance an alkene as in any ordinary radical polymerization.
The carbonyl group draws electrons away from the alkene, and the alkene group is, therefore, deactivated towards an electrophile, such as bromine or hydrochloric acid.
