Vignolle J, Donnadieu B, Bourissou D, Bertrand G. An unusual norcaradiene/tropylium rearrangement from a persistent amino-phosphonio-carbene.
Tetrahedron Lett 2007;
48:685-687. [PMID:
19513183 DOI:
10.1016/j.tetlet.2006.11.099]
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Abstract
An amino-phosphonio-carbene featuring a bromobiphenyl backbone was prepared and spectroscopically characterized at low temperature. This carbene was found to readily rearrange upon warm up, affording an original tricyclic phospholium derivative, presumably via a norcaradiene/tropylium isomerization.
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