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Cyclocarbon
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, a cyclo[<i>n</i>]carbon (or simply cyclocarbon) is a <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> consisting solely of a number <i>n</i> of <a href="/facts/Carbon/ukrgQexo">carbon</a> atoms <a href="/facts/Covalent_bond/EzMLf3Pz">covalently</a> linked in a <a href="/facts/Ring_(chemistry)/EVFmy88Q">ring</a>. Since the compounds are composed only of carbon atoms, they are <a href="/facts/Allotropes_of_carbon/GSetCyq6">allotropes of carbon</a>. Possible bonding patterns include all <a href="/facts/Double_bond/qDemMn0c">double bonds</a> (a cyclic <a href="/facts/Cumulene/UtxYSvxN">cumulene</a>) or alternating <a href="/facts/Single_bond/8qz02fEl">single bonds</a> and <a href="/facts/Triple_bond/poDWRayX">triple bonds</a> (a cyclic <a href="/facts/Polyyne/ReohbKe8">polyyne</a>). </p><p>The first cyclocarbon synthesized is <a href="/facts/Cyclo(18)carbon/ddBuh5XH">cyclo[18]carbon</a> (C18). Besides that, C6, C10, C12, C13, C14, C16, C20, and C26 are all known. </p>