Term: diisotactic polymer https://doi.org/10.1351/goldbook.D01731 Definition: An isotactic polymer that contains two chiral or prochiral atoms with defined stereochemistry in the main chain of the configurational base unit. Related Terms: 1) isotactic polymer (http://doi.org/10.1351/goldbook.I03316). 2) prochiral (http://doi.org/10.1351/goldbook.P04859). 3) configurational base unit (<em>in polymers</em>) (http://doi.org/10.1351/goldbook.C01250). 4) chiral (http://doi.org/10.1351/goldbook.C01057). Source: Purple Book, 1st ed., p. 32 (http://old.iupac.org/publications/books/author/metanomski.html) Citation: 'diisotactic polymer' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.D01731 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. 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.