04376 IUPAC Gold Book - oxo carboxylic acids 10.1351/goldbook.O04376 O04376 current synonym: oxo acids 1 Compounds having a carboxy group as well as an aldehydic or ketonic group in the same molecule, e.g. $\ce{HC(=O)CH2CH2CH2C(=O)OH}$ 5-oxopentanoic acid. In an organic context the term is generally shortened to oxo acids. The full name should be used if confusion with oxoacids seems possible. oxoacids https://goldbook.iupac.org//terms/view/O04374 PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1354 (https://doi.org/10.1351/pac199567081307) https://goldbook.iupac.org/terms/view/O04376/html https://goldbook.iupac.org/terms/view/O04376/json https://goldbook.iupac.org/terms/view/O04376/plain Citation: 'oxo carboxylic acids' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.O04376 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. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. 2026-06-21T03:16:07+00:00