00268 IUPAC Gold Book - amidium ions 10.1351/goldbook.A00268 A00268 current 1 Cations formally derived by the addition of one hydron to the $\ce{N}$ or $\ce{O}$ atom of an amide and $N$-hydrocarbyl derivatives thereof. In organic chemistry an unspecified amidium ion is commonly a carboxamidium ion or The term does not imply knowledge concerning the position of the cationic centre, e.g. $\ce{PhC(=O)N^{+}Me3}$ N,N,N-trimethylbenzamidium. amide https://goldbook.iupac.org//terms/view/A00266 hydrocarbyl https://goldbook.iupac.org//terms/view/H02891 hydron https://goldbook.iupac.org//terms/view/H02904 PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1315 (https://doi.org/10.1351/pac199567081307) PAC, 1993, 65, 1357. 'Revised nomenclature for radicals, ions, radical ions and related species (IUPAC Recommendations 1993)' on page 1357 (https://doi.org/10.1351/pac199365061357) https://goldbook.iupac.org/terms/view/A00268/html https://goldbook.iupac.org/terms/view/A00268/json https://goldbook.iupac.org/terms/view/A00268/plain Citation: 'amidium ions' 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.A00268 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. 2026-05-06T17:22:12+00:00