Claisen rearrangement on an aromatic system – [3,3]-Sigmatropic rearrangement

ThionylChloride

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4.3
(3)

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The first step in the reaction is a pericyclic [3,3]-sigmatropic rearrangement, which happens through a chair-like transition state. The second step is a simple proton transfer to regenerate aromaticity.

K. C. Majumdar and R. K. Nandi, Tetrahedron, 2013, 69, 6921–6957.

 

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