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allene
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allene

Any of a class of dienes (hydrocarbons with two double bonds) with adjacent double bonds. The simplest example is CH2=C=CH2, allene itself. Because of the stereochemistry of the double bonds, the terminal hydrogen atoms lie in planes mutually at right angles. Allenes behave mainly as typical unsaturated compounds, but are less stable than dienes with nonadjacent double bonds.



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Such methods were also reported and include the use of a palladium-catalyzed enantioselective diboration of allenes (eq.
Chiral [alpha]-substituted allylboronates in a one-pot ... by Carosi, Lisa; Hall, Dennis G. / Canadian Journal of Chemistry
Carbonylation of Allenes (Akihiro Nomoto, Akiya Ogawa).
Discover Modern Carbonylation Methods by Business Wire
The more common routes involve (i) an indirect transmetallation method, which commonly uses organomercury compounds and (ii) carbon monoxide assisted cyclocarbonylation using alkynes or allenes leading to metallacyclopentadienones.
Reactivity of IrCl[(P[Ph.sub.3]).sub.3] with diphenylacetylene--a ... by Choudhury, Joyanta; Pratihar, Sanjay; Maity, Arnab Kumar; Roy, Sujit / Canadian Journal of Chemistry
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