{"term":{"id":"08942","title":"chain activation","longtitle":"IUPAC Gold Book - chain activation","doi":"10.1351\/goldbook.08942","code":"08942","status":"current","synonym":"<em>synonyms<\/em>: activation (in ATRP), bimolecular activation, bimolecular chain activation","definitions":[{"id":1,"text":"Reaction of an activator with a dormant species to form a deactivator and a propagating species.","notes":{"1":"The activation and deactivation process may form part of a catalytic cycle. However, in general, the activator should not be called a catalyst.","2":"Chain deactivation (in ATRP) is the reverse of chain activation (in ATRP)."},"contexts":[],"links":[{"term":"Chain deactivation","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08943"},{"term":"deactivator","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08949"},{"term":"dormant species","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08952"},{"term":"propagating species","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08966"}],"sources":["PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1117 (https:\/\/doi.org\/10.1515\/pac-2020-1211)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/08942\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/08942\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/08942\/plain"},"citation":"Citation: 'chain activation' 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.08942","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":"2026-06-21T19:46:22+00:00"}}