![[4]Rotane consists of a cyclobutane core, with a spiro-cyclopropane on each corner of it 4-Rotane.png](http://upload.wikimedia.org/wikipedia/commons/thumb/b/bd/4-Rotane.png/220px-4-Rotane.png)
A rotane is a hydrocarbon consisting of a central cycloalkane ring with cyclopropane units spiro-linked to each corner. The systematic naming pattern for these molecules is "[n]rotane", where n is the number of atoms in the central ring.
The simplest such chemical, [3]rotane, consists solely of a branched array of spiro-cyclopropane units, and is thus a branched triangulane.
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