A spiro compound is a bicyclic organic compound with rings connected through just one atom. The rings can be different in nature or identical. The connecting atom is also called the spiroatom, most often a quaternary carbon ("spiro carbon"). All spiro compounds have the infix spiro followed by square brackets containing the number of atoms in the smaller ring and the number of atoms in the larger ring excluding the spiroatom itself; the numbers being separated by a dot. For example compound A is called 1-bromo-3-chlorospirodecan-7-ol and compound B is called 1-bromo-3-chlorospirodecan-7-ol. The spiro compound consisting of a cyclohexane ring and a cyclopentane ring is called spirodecane. This nomenclature was proposed by Adolf von Baeyer in 1900 .
An example of a spiro compound with a trivial name: spiropentadiene.
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