FACTOID # 30: If Alaska were its own country, it would be the 26th largest in total area, slightly larger than Iran.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Alkynes" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


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.



Contents

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.








Examples

The simplest alkyne is ethyne (acetylene):




image:ethyne.png




Reactions

  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 »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m