Cumulene

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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What Wikipedia says

A cumulene is a compound having three or more cumulative (consecutive) double bonds. They are analogous to allenes, such as propadiene, but with at least one additional alkene unit. The simplest molecule in this class is thus butatriene (H2C=C=C=CH2), which is also called simply cumulene.

Excerpt from the Wikipedia article “Cumulene”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jynto and Ben Mills, Public domain, via Wikimedia Commons.