Title: deactivator
Long Title: IUPAC Gold Book - deactivator
DOI: 10.1351/goldbook.08949
Status: current

Definition
Reagent that reacts reversibly with the initiating species or propagating species to form an initiator or a dormant chain, respectively, and an activator.

Related Terms
- dormant chain: https://goldbook.iupac.org//terms/view/08952
- initiating species: https://goldbook.iupac.org//terms/view/08959
- propagating species: https://goldbook.iupac.org//terms/view/08966

Source
- PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1119 (https://doi.org/10.1515/pac-2020-1211)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/08949/html
- json: https://goldbook.iupac.org/terms/view/08949/json
- xml: https://goldbook.iupac.org/terms/view/08949/xml

Citation: Citation: 'deactivator' 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.08949
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: 2026-04-18T09:11:36+00:00