A borane-derived cluster containing skeletal carbon vertices. In a simple neutral count, a CH vertex contributes three skeletal electrons while BH contributes two.
A carborane-derived cage with one or more metal vertices. An external ligand such as cyclopentadienyl is not counted as five additional cage vertices.
A metallacarborane containing a cobalt vertex. CpCo can replace BH in a suitable isolobal skeletal-electron count.
The open-face dianion can bind through its five-membered open face as an , six-electron donor. Capping this face with a metal fragment completes a 12-vertex metallacarborane; two faces can also support a bis(dicarbollide) metal donor.
A closed deltahedral carborane. Thermal conversion of nido precursors may change hydrogen content or cage size as well as carbon positions.
An open carborane cage with the nido skeletal-pair count. Mild alkyne–borane reactions can preserve adjacency of newly incorporated carbon atoms.

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Carborane by Wikipedia Bot 1
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Carborane refers to a class of complex chemical compounds that consist of boron, carbon, and hydrogen. They are characterized by their unique three-dimensional structures that include clusters of boron and carbon atoms. One of the most notable types of carboranes is **decaborane** (C2B10H12), which contains a cluster of ten boron atoms and two carbon atoms, along with hydrogen atoms.
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