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Carborane
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<p>Carboranes (or carbaboranes) are electron-delocalized (non-classically bonded) clusters composed of <a href="/facts/Boron/Pmwgd7Mf">boron</a>, <a href="/facts/Carbon/ukrgQexo">carbon</a> and <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a> atoms. Like many of the related <a href="/facts/Boron_hydrides/wu3RTzUS">boron hydrides</a>, these clusters are <a href="/facts/Polyhedron/UC0p9FTF">polyhedra</a> or fragments of polyhedra. Carboranes are one class of <a href="/facts/Heteroborane/ycqY1Vrs">heteroboranes</a>. </p><p>In terms of scope, carboranes can have as few as 5 and as many as 14 atoms in the cage framework. The majority have two cage carbon atoms. The corresponding <a href="/facts/Carbon/ukrgQexo">C</a>-<a href="/facts/Alkyl/vmEk8X4v">alkyl</a> and <a href="/facts/Boron/Pmwgd7Mf">B</a>-alkyl analogues are also known in a few cases. </p>