01571 IUPAC Gold Book - degrees of cistacticity and transtacticity 10.1351/goldbook.D01571 D01571 current 1 For a regular polymer containing double bonds in the main chain of the constitutional repeating units these are the fractions of such double bonds that are in the cis and trans configurations, respectively. constitutional repeating units https://goldbook.iupac.org//terms/view/C01286 regular polymer https://goldbook.iupac.org//terms/view/R05249 trans https://goldbook.iupac.org//terms/view/C01092 Purple Book, 1st ed., p. 46 (http://old.iupac.org/publications/books/author/metanomski.html) https://goldbook.iupac.org/terms/view/D01571/html https://goldbook.iupac.org/terms/view/D01571/json https://goldbook.iupac.org/terms/view/D01571/plain Citation: 'degrees of cistacticity and transtacticity' 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.D01571 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. 2026-05-12T16:17:14+00:00