moiety

https://doi.org/10.1351/goldbook.M03968
In physical organic chemistry moiety is generally used to signify part of a molecule, e.g. in an ester $\ce{R1COOR2}$ the alcohol moiety is $\ce{R2O}$. The term should not be used for a small fragment of a molecule.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1141 [Terms] [Paper]
Citation: 'moiety' 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.M03968 RIS BibTex EndNote
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