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Structural isomer
Structural isomerism, or constitutional isomerism (per IUPAC), is a form of isomerism in which molecules with the same molecular formula have bonded together in different orders, as opposed to stereoisomerism.〔Clark, Jim. "Structural isomerism" in ''Chemguide'', n.l., 2000, December 7 (Web article )〕 There are multiple synonyms for constitutional isomers.
Three categories of constitutional isomers are skeletal, positional, and functional isomers. Positional isomers are also called regioisomers.
==Chain isomerism==
In chain isomerism, or skeletal isomerism, components of the (usually carbon) skeleton are distinctly re-ordered to create different structures. Pentane exists as three isomers: ''n''-pentane (often called simply "pentane"), isopentane (2-methylbutane) and neopentane (dimethylpropane).
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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