07449 IUPAC Gold Book - photo-Claisen rearrangement 10.1351/goldbook.PT07449 PT07449 current 1 Rearrangement closely related to the photo-Fries rearrangement; it is experienced by aryl ethers (instead of aryl esters) and follows an analogous mechanism. An example is the photoinduced rearrangement of phenyl ethers to ortho and para-alkyl phenols. Rearrangement https://goldbook.iupac.org//terms/view/R05194 esters https://goldbook.iupac.org//terms/view/E02219 ethers https://goldbook.iupac.org//terms/view/E02221 phenols https://goldbook.iupac.org//terms/view/P04539 photo-Fries rearrangement https://goldbook.iupac.org//terms/view/P04614 PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 387 (https://doi.org/10.1351/pac200779030293) https://goldbook.iupac.org/terms/view/PT07449/html https://goldbook.iupac.org/terms/view/PT07449/json https://goldbook.iupac.org/terms/view/PT07449/plain Citation: 'photo-Claisen rearrangement' 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.PT07449 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. 2026-06-10T02:31:28+00:00