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Spiro compound
A spiro compound is a bicyclic organic compound with rings connected through just one atom. The rings can be different in nature or identical, and are usually twisted compared to each other. The connecting atom is also called the spiroatom and is most often a quaternary carbon ("spiro carbon"), though many spiropyrans, spiroacetals and other variations are also known. 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-chlorospiro()decan-7-ol'' and compound B is called ''1-bromo-3-chlorospiro()decan-7-ol''. The spiro compound consisting of a cyclohexane ring and a cyclopentane ring is called ''spiro()decane''. This nomenclature was proposed by Adolf von Baeyer in 1900.〔
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An example of a spiro compound with a trivial name: spiropentadiene.
==Acetals==
Acetals of cyclic ketones with diols or dithiols are spiro compounds. An example is spirapril, with a five-membered ring formed from 1,2-ethanedithiol.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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