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Reference.org
Ethynyl group
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, an ethynyl group is a functional group with the formula −C≡CH, representing an <a href="/facts/Acetylene/yaDh6cmJ">acetylene</a> molecule with one fewer hydrogen atom. </p> <ul><li>Ethynyl group (HC≡C–), also designated as an acetylenic group (from <a href="/facts/Acetylene/yaDh6cmJ">acetylene</a>), is referred to in IUPAC chemical nomenclature with the <a href="/facts/-yne/MtT2YkH9">-yne</a> suffix. It is sometimes designated as <i>ethinyl</i> in compounds such as <a href="/facts/Ethinylestradiol/aYRGLz8n">ethinylestradiol</a> and <a href="/facts/Ethisterone/gbLG3WjT">ethisterone</a> (ethinyltestosterone). See main page <a href="/facts/Alkyne/VHI4N5Wo">alkynes</a>.</li></ul>