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Encyclopedia > Alkynes

Alkynes are hydrocarbons that have at least one triple bond between carbon atoms. The alkynes are traditionally known as acetylenes, though the name acetylene is also used to refer specifically to the simplest member of the series, known officially as ethyne.


Physical properties

Unlike an alkane an alkyne is unstable and very reactive. This gives rise to the intense heat of the acetylene flame used in welding.


The simplest alkyne is ethyne (acetylene):



  1. Diels-Alder reaction
  1. * Pyrone Diels-Alder → aromatic species
  1. Alkyne-azide reaction → Triazoles
  1. enediynes (alkyne - alkene - alkyne) → aromatics (Bergman cyclization)

Terminal alkynes

  1. terminal alkyne + strong baseanion of terminal alkyne
    • anion of terminal alkyne + methyl or primary alkyl halide → new carbon-carbon bond
  1. terminal alkyne + dialkylborane + hydrogen peroxidealdehyde

  Results from FactBites:
The Organometallic HyperTextBook: Alkyne Complexes (759 words)
The bonding of an alkyne (acetylene) to a transition metal complex is similar to that of an alkene complex.
Alkynes tend to be more electropositive and therefore tend to bind more tightly to a transition metal than alkenes.
A number of transition metal alkyne complexes are intermediates in the cyclotrimerization of alkynes to substituted benzenes.
Alkyne - Wikipedia, the free encyclopedia (634 words)
Alkynes are generally prepared by dehydrohalogenation of vicinal alkyl dihalides or the reaction of metal acetylides with primary alkyl halides.
scrambling of alkynes in alkyne metathesis to new alkyne compounds
[2+2+1]cycloaddition of an alkyne, alkene and carbon monoxide in the Pauson–Khand reaction
  More results at FactBites »



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