allenes

https://doi.org/10.1351/goldbook.A00238
Hydrocarbons (and by extension, derivatives formed by substitution) having two double bonds from one carbon atom to two others $\ce{R2C=C=CR2}$. (The simplest member, propadiene, is known as allene).
See also: cumulenes, dienes
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1314 [Terms] [Paper]
Citation: 'allenes' 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.A00238 RIS BibTex EndNote
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