Acetylenic

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In organic chemistry, the term acetylenic designates^[1]

A doubly unsaturated position (sp-hybridized) on a molecular framework, for instance in an alkyne such as acetylene;
An ethynyl fragment, HC $\equiv$ C–, or substituted homologue.

See also

References

^ Tucker, William B. (2024-06-20). Organic Chemistry: Structure, Function, and Practice (1 ed.). Boca Raton: CRC Press. doi:10.1201/9781003479352. ISBN 978-1-003-47935-2.