Term: lignans https://doi.org/10.1351/goldbook.L03527 Definition: Plant products of low molecular weight formed primarily from oxidative coupling of two p-propylphenol moieties at their β carbon atoms; products with units coupled in other ways are neolignans, e.g. L03527-1.png L03527-2.png Related Terms: 1) molecular weight (http://doi.org/10.1351/goldbook.M04000). 2) oxidative coupling (http://doi.org/10.1351/goldbook.O04368). Images: 1) Not defined (https://goldbook.iupac.org/img/inline/L03527-1.png) 2) Not defined (https://goldbook.iupac.org/img/inline/L03527-2.png) Source: PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1347 (https://doi.org/10.1351/pac199567081307) Citation: 'lignans' 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.L03527 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.