02564 IUPAC Gold Book - fusion name 10.1351/goldbook.F02564 F02564 current 1 A composite name for a polycyclic parent structure having the maximum number of non-cumulative double bonds and at least one ortho fusion. Name formation involves the dissection of the structure into contiguous components having recognized trivial or semisystematic names, one of which is selected as the 'base component'. attachment of the other components is described by prefixes. attachment https://goldbook.iupac.org/terms/view/A00512 composite https://goldbook.iupac.org/terms/view/CT07545 cumulative double bonds https://goldbook.iupac.org/terms/view/C01437 Blue Book Guide, p. 14 (https://doi.org/10.1351/pac199971071327) https://goldbook.iupac.org/terms/view/F02564/html https://goldbook.iupac.org/terms/view/F02564/json https://goldbook.iupac.org/terms/view/F02564/plain Citation: 'fusion name' 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.F02564 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. 2026-06-28T09:46:10+00:00