Title: number of generations
Long Title: IUPAC Gold Book - number of generations
DOI: 10.1351/goldbook.09623
Status: current

Definition
Number of constitutional repeating units on the path from the free valence to any end-group of a dendron.

Note
The number of generations \(G\) is a cardinal number. A dendron with \(G = n\) generations of constitutional repeating units should be called \(n\mbox{-}\rm{generation}\) dendron. The terms "dendron of \(n^{\rm{th}}\) generation" or "\(n^{\rm{th}}\) generation dendron" are not acceptable.

Related Term
- dendron: https://goldbook.iupac.org//terms/view/09611

Source
- PAC, 2019, 91, 523. 'Nomenclature and terminology for dendrimers with regular dendrons and for hyperbranched polymers (IUPAC Recommendations 2017)' on page 533 (https://doi.org/10.1515/pac-2016-1217)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/09623/html
- json: https://goldbook.iupac.org/terms/view/09623/json
- xml: https://goldbook.iupac.org/terms/view/09623/xml

Citation: Citation: 'number of generations' 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.09623
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.
Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .
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.
Accessed: 2026-07-15T08:30:58+00:00