= Adamantane
<Adamantane> is the saturated cage <hydrocarbon> $\mathrm{C_{10}H_{16}}$. Its carbon framework is a compact three-dimensional network of fused chair-like six-membered rings, with the connectivity recorded by its tricyclic structural name.<NIST Chemistry WebBook, SRD 69>[Adamantane, CAS281-23-2: formula and tricyclo connectivity]{ref}
The rigid cage restricts conformational motion. Symmetry can make several carbon or hydrogen positions equivalent in a spectrum, while substitution breaks those equivalences. The molecule therefore provides a useful example of how three-dimensional connectivity and molecular symmetry influence chemical reactivity and spectroscopic counting.
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