Alkynes are molecules that contain carbon-carbon triple bonds. They are named under the systematic nomenclature scheme in the same way that alkenes are, except that instead of the name ending with the suffix –ene, the names of alkynes end with the suffix –yne. As with alkenes, a number in the prefix is used to indicate the position of the alkyne in the molecule, as shown here.
Alkynes are often known by their common names; these common names are derivatives of the simplest alkyne, acetylene. Under the common name system, the two R groups are named as substituents of acetylene (the next figure shows some examples). An alkyne with two methyl groups would be dimethyl acetylene, an alkyne with two isopropyl groups, diisopropyl acetylene, and so on.
