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Alkyne trimerisation
A alkyne trimerisation reaction is a [2+2+2] cycloaddition where three alkyne molecules react to form a benzene compound.
In the example of phenyl acetylene a simple catalyst system of cobalt dibromide / zinc / zinc iodine suffices to obtain 99% chemical yield and 97% regioselectivity in favor of reaction product 1.
references
A simple cobalt catalyst system for the efficient and regioselective cyclotrimerisation of alkynes Gerhard Hilt , Thomas Vogler , Wilfried Hess, Fabrizio Galbiati Chem. Commun., 2005, (11), 1474
Last updated: 10-19-2005 13:41:55
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details