<a href="https://en.wikipedia.org/wiki/Skeletal_structure" class="extiw" title="en:Skeletal structure">Skeletal structures</a> for the <a href="https://en.wikipedia.org/wiki/alkyne_trimerisation" class="extiw" title="en:alkyne trimerisation">alkyne trimerisation</a> reaction of three molecules of <a href="https://en.wikipedia.org/wiki/2-butyne" class="extiw" title="en:2-butyne">2-butyne</a> to give <a href="https://en.wikipedia.org/wiki/hexamethylbenzene" class="extiw" title="en:hexamethylbenzene">hexamethylbenzene</a>, in the presence of various <a href="https://en.wikipedia.org/wiki/catalyst" class="extiw" title="en:catalyst">catalysts</a>.
<a href="//commons.wikimedia.org/wiki/User:DMacks" title="User:DMacks">DMacks</a> (<a href="//commons.wikimedia.org/wiki/User_talk:DMacks" title="User talk:DMacks"><span class="signature-talk">talk</span></a>)
<span class="int-own-work" lang="en">Own work</span>