Science Fair Project Encyclopedia
Electrocyclic reaction
An electrocyclic reaction is a type of pericyclic rearrangement reaction where the net result is one pi bond being converted into one sigma bond. These reactions are usually unnamed, being categorized by the following criteria:
- photoinduced vs thermal
- number of pi electrons (in the species with more pi bonds)
- ring closure or ring opening
- stereospecifity is determined by conrotatory or disrotatory mode of transition state formation.
Examples:
- a [6-pi] electrocyclic ring closure takes all-cis hexatriene to 1,4 cyclohexadiene.
- the Fischer indole synthesis contains a [3,3] sigmatropic rearrangement
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