Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A cumulene is a chemical compound with two or more cumulative double bonds, for example butatriene, H2C=C=C=CH2. Unlike alkanes and most alkenes, cumulenes tend to be rigid, which makes them appealing for molecular nanotechnology. Polyynes are another kind of rigid carbon chains. Cumulenes are found in regions of space where hydrogen is rare. See astrochemistry

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