Exempel på alkyne

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

• Alternatively, acetylene may yield amino acids directly via a conversion of an alkyne to the corresponding aldehyde, which then forms an alpha amino nitrile and eventually an amino acid.

• Additionally, this compound can by produced through the hydration of an alkyne through mecuric sulfate catalysis.

• Using a protected alkyne, as opposed to acetylene gas, prevents further (undesired) coupling reactions and also has the benefit of being a liquid.

• The four main categories are (1) nucleophilic attack on an alkene alkyne, or allyl ligand and (2) insertion of the alkene into the metal-amide bond.

• Usually, the substrate is an alkene or an alkyne.

• The reaction shown below involves an alkyne oxymercuration reaction to generate the requisite ketone.

• In the first step of this reaction, a metal acetylide is formed by reaction of the terminal alkyne with the copper salt.

• In the uncatalysed reaction the alkyne remains a poor electrophile.

• The proton transfer leads to intermediate 4, which undergoes the key fragmentation to alkyne (6) and the corresponding carbonyl compound (7).

• Alkenylalanes, which are easily synthesized with complete stereocontrol through alkyne hydroalumination, transfer the alkenyl unit to a variety of electrophiles.

• It is composed of both alkyne and alkene groups.

• Molecules called ene-diynes feature a ring containing an alkene (ene) between two alkyne groups (diyne).

• The most problematic side products of the reaction are due to cyclotetramerization (leading to cyclooctatetraenes) and alkyne dimerization (leading to enynes).

• The conjugated alkyne is reduced to the methyl ester.