Exempel på alkene

• The data indicated that at least one alkene was present.

• Paraffins are formed simultaneously with the alkene series but no acetylenic hydrocarbons have been detected.

• All reactions proceed via an initial addition of the radical to alkenes, alkynes and aromatic species.

• The relative proportions of alkenes were higher in this group (around 28 % versus 18 % of the total hydrocarbons).

• The chemoselective ruthenium-catalysed olefin metathesis reaction was used to 'staple' together the two alkene tethers to provide peptides that maintain helical structure, but with enhanced stability.

• Methane, a series of about 20 different alkenes with single and conjugated double bonds have been detected.

• The epoxides are prepared by oxidation with hydrogen peroxide of the alkene.

• 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.

• The carbon radical starts polymer chain formation with monomer for instance an alkene as in any ordinary radical polymerization.

• In contrast, unactivated styrene reacts instead at the alkene alone via a linear polymerization reaction.

• Dimethylamine addition opened the thiolactone ring with an exocyclic alkene group in 60 by elimination of the sulfide anion from the methyl group.

• Hydroformylation, also known as oxo synthesis, is the reaction of an alkene with carbon monoxide and hydrogen.

• The first reaction step involves 1,4-addition of the catalytic tertiary amine to the activated alkene to generate the zwitterionic aza-enolate.

• This process is believed to occur through direct attack of the distal bond on the coordinated alkene.

• A related effect is the alkene cis effect.