{"term":{"id":"01287","title":"constitutional sequence","longtitle":"IUPAC Gold Book - constitutional sequence","doi":"10.1351\/goldbook.C01287","code":"C01287","status":"current","also defines":"<em>also defines<\/em>: diads, triads, tetrads, pentrads","definitions":[{"id":1,"text":"The whole or part of a chain comprising one or more species of constitutional unit(s) in defined sequence.","notes":{"1":"Constitutional sequences comprising two constitutional units are termed diads, those comprising three constitutional units triads, and so on. In order of increasing sequence lengths they are called tetrads, pentads, hexads, heptads, octads, nonads, decads, undecads, etc."},"contexts":[],"links":[{"term":"chain","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/C00946"},{"term":"constitutional unit(s)","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/C01288"},{"term":"sequence","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/ST06775"}],"sources":["PAC, 1996, 68, 2287. 'Glossary of basic terms in polymer science (IUPAC Recommendations 1996)' on page 2299 (https:\/\/doi.org\/10.1351\/pac199668122287)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/C01287\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/C01287\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/C01287\/plain"},"citation":"Citation: 'constitutional sequence' 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.C01287","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":"2026-04-18T15:08:42+00:00"}}