08927 IUPAC Gold Book - outer-sphere electron transfer ATRP 10.1351/goldbook.08927 08927 current synonyms: OSET-ATRP, single-electron-transfer RDRP (SET-RDRP) 1 Atom-transfer radical polymerization where the activation step involves consecutive single electron transfer and atom or group transfer. The terms SET-RDRP (single-electron-transfer reversible-deactivation radical polymerization), SET-LRP (single-electron-transfer living radical polymerization), and zero-valent metal-mediated polymerization (e.g., \(\ce{Cu^{0}}\)-mediated radical polymerization) are sometimes used to describe a process where the polymerization commences with the activator in the form of a zero-valent metal, e.g., \(\ce{Cu^{0}}\). The use of terms that might imply an outer sphere electron-transfer mechanism without evidence that the reaction proceeds by OSET-ATRP is deprecated. Terms containing the phrase 'living radical polymerization' are deprecated. OSET-ATRP may be referred to as ATRP. ATRP https://goldbook.iupac.org//terms/view/08924 inner-sphere electron transfer ATRP https://goldbook.iupac.org//terms/view/08925 PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1110 (https://doi.org/10.1515/pac-2020-1211) https://goldbook.iupac.org/terms/view/08927/html https://goldbook.iupac.org/terms/view/08927/json https://goldbook.iupac.org/terms/view/08927/plain Citation: 'outer-sphere electron transfer ATRP' 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.08927 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. 2026-06-29T10:04:34+00:00