Title: syn Long Title: IUPAC Gold Book - syn DOI: 10.1351/goldbook.S06216 Status: current Definition See: torsion angleSee: endo, exo, syn, antiSee: antiFormerly used to describe the stereochemistry of oximes and related systems.See: E, Z Related Terms - E, Z: https://dev.goldbook.iupac.org/terms/view/E01882 - endo, exo, syn, anti: https://dev.goldbook.iupac.org/terms/view/E02094 - anti: https://dev.goldbook.iupac.org/terms/view/A00381 - oximes: https://dev.goldbook.iupac.org/terms/view/O04372 - torsion angle: https://dev.goldbook.iupac.org/terms/view/T06406 Source - PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2220 (https://doi.org/10.1351/pac199668122193) Other Outputs - html: https://dev.goldbook.iupac.org/terms/view/S06216/html - json: https://dev.goldbook.iupac.org/terms/view/S06216/json - xml: https://dev.goldbook.iupac.org/terms/view/S06216/xml Citation: Citation: 'syn' 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.S06216 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: 2025-11-14T21:31:57+00:00