Ethynyl group

In organic chemistry, an ethynyl group is a functional group with the formula −C≡CH. It is the acetylene molecule with one fewer hydrogen atom. The name is also used for any compound containing that group, namely R−C≡CH where R is any other group of atoms.

• Ethynyl group (HC≡C–), also designated as acetylenic group (from acetylene), and referred to in IUPAC chemical nomenclature as -yne suffix. Also sometimes designed as ethinyl in compounds (ethinylestradiol, ethisterone (ethinyltestosterone)). See main page alkynes.
• Ethynyl radical (HC≡C·), the compound found in interstellar medium, and transiently on earth during chemical reactions.
• Ethynyl carbanion acetylide (HC≡C⁻)

See also

• Ethynylation
• Propynyl ( H₃C–C≡C–R, 1-propynyl group; or HC≡C–CH₂–R, 2-propynyl group, Propargyl)