Title: dienes
Long Title: IUPAC Gold Book - dienes
DOI: 10.1351/goldbook.D01699
Status: current

Definition
Compounds that contain two fixed double bonds (usually assumed to be between carbon atoms). Dienes in which the two double-bond units are linked by one single bond are termed conjugated, e.g. $\ce{CH2=CH–CH=CH2}$ buta-1,3-diene. Dienes in which the double bonds are adjacent are called cumulative, e.g. $\ce{CH3–CH=C=CH2}$ buta-1,2-diene. Those in which one or more of the unsaturated carbon atoms is replaced by a heteroatom may be called heterodienes.

Related Terms
- alkenes: https://goldbook.iupac.org//terms/view/A00224
- allenes: https://goldbook.iupac.org//terms/view/A00238
- cumulenes: https://goldbook.iupac.org//terms/view/C01440
- diols: https://goldbook.iupac.org//terms/view/D01748
- olefins: https://goldbook.iupac.org//terms/view/O04281

Source
- PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1332 (https://doi.org/10.1351/pac199567081307)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/D01699/html
- json: https://goldbook.iupac.org/terms/view/D01699/json
- xml: https://goldbook.iupac.org/terms/view/D01699/xml

Citation: Citation: 'dienes' 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.D01699
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Accessed: 2026-06-20T15:21:57+00:00