09611 IUPAC Gold Book - dendron 10.1351/goldbook.09611 09611 current 1 Part of a molecule with only one free valence, comprising exclusively dendritic and terminal constitutional repeating units and in which each path from the free valence to any end-group comprises the same number of constitutional repeating units. For the purpose of determining the nature of constitutional repeating units the free valence is treated as a connection to a CRU. A dendrimer molecule comprising only one dendron is sometimes referred to as dendron, monodendron or functionalised dendron. The use of the terms ‘dendron’ or ‘monodendron’ in the meaning of molecule or substance is not acceptable. In a dendron, macrocycles of constitutional units are absent. Example of a regular dendron, highlighting dendritic constitutional repeating units, terminal constitutional repeatingunits, end-groups, the dendron direction and the free valence. The preferred constitutional repeating unit is chosen such that the branch points are at its end in the dendron direction. dendrimer molecule https://goldbook.iupac.org//terms/view/09605 dendritic constitutional repeating units https://goldbook.iupac.org//terms/view/09607 dendron direction https://goldbook.iupac.org//terms/view/09612 terminal constitutional repeating units https://goldbook.iupac.org//terms/view/09630 PAC, 2019, 91, 523. 'Nomenclature and terminology for dendrimers with regular dendrons and for hyperbranched polymers (IUPAC Recommendations 2017)' on page 529 (https://doi.org/10.1515/pac-2016-1217) https://goldbook.iupac.org/terms/view/09611/html https://goldbook.iupac.org/terms/view/09611/json https://goldbook.iupac.org/terms/view/09611/plain Citation: 'dendron' 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.09611 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. 2026-07-26T01:31:20+00:00