Term: aryl groups https://doi.org/10.1351/goldbook.A00464 Definition: Groups derived from arenes by removal of a hydrogen atom from a ring carbon atom. Groups similarly derived from heteroarenes are sometimes subsumed in this definition. E.g. o-tolyl: A00464.png Related Terms: 1) arenes (http://doi.org/10.1351/goldbook.A00435). 2) heteroarenes (http://doi.org/10.1351/goldbook.H02791). 3) heteroaryl groups (http://doi.org/10.1351/goldbook.H02792). Image: Not defined (https://goldbook.iupac.org/img/inline/A00464.png) Source: PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1320 (https://doi.org/10.1351/pac199567081307) Citation: 'aryl groups' 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.A00464 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.