cumulenes 

https://doi.org/10.1351/goldbook.C01440
@H02889@ (and by extension, derivatives formed by substitution) having three or more @C01437@, e.g. R2C=C=C=CR2.
See also: allenes, heterocumulenes
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1329 [Terms] [Paper]
Citation: 'cumulenes' 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.C01440 RIS BibTex EndNote
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Last revised: February 24, 2014