isotopomer

https://doi.org/10.1351/goldbook.I03352
Isomers having the same number of each isotopic atom but differing in their positions. The term is a contraction of 'isotopic isomer'. Isotopomers can be either constitutional isomers (e.g. $\ce{CH2DCH=O}$ and $\ce{CH3CD=O}$) or isotopic stereoisomers [e.g. $\ce{(\textit{R})-}$ and $\ce{(\textit{S})-CH3CHDOH}$ or $\ce{(\textit{Z})-}$ and $\ce{(\textit{E})-CH3CH=CHD}$].
Sources:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1132 [Terms] [Paper]
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2211 [Terms] [Paper]
Citation: 'isotopomer' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.I03352 RIS BibTex EndNote
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