{"term":{"id":"01089","title":"<i>cis<\/i>-fused","longtitle":"IUPAC Gold Book - <i>cis<\/i>-fused","doi":"10.1351\/goldbook.C01089","code":"C01089","status":"current","also defines":"<em>also defines<\/em>: <i>trans<\/i>-fused","definitions":[{"id":1,"text":"Steric relations at saturated bridgeheads common to two rings are denoted by cis or trans, followed by a hyphen and placed before the name of the ring system, according to the relative positions of the exocyclic atoms or groups attached to the bridgeheads. Such rings are said to be cis-fused or trans-fused.","links":[{"term":"<em>trans<\/em>","url":"https:\/\/goldbook.iupac.org\/terms\/view\/C01092"},{"term":"bridgeheads","url":"https:\/\/goldbook.iupac.org\/terms\/view\/B00736"}],"sources":["Blue Book, p. 479 (https:\/\/www.acdlabs.com\/iupac\/nomenclature\/)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/C01089\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/C01089\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/C01089\/plain"},"citation":"Citation: '<i>cis<\/i>-fused' 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.C01089","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":"2026-05-15T02:29:59+00:00"}}