A Forbidden Rearrangement

A barrelene derivative fragments to afford benzene and trappable 1,2,3-tricyanocyclopropene. The barrelene anion fragments more easily to liberate benzene and the 1,2,3-tricyanocyclopropenyl anion, which is not trappable or stable in solution. However, the major thermal product from the barrelene an...

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Veröffentlicht in:Organic letters 2003-09, Vol.5 (19), p.3407-3409
Hauptverfasser: Leivers, Martin, Tam, Iris, Groves, Kevin, Leung, David, Xie, Yuli, Breslow, Ronald
Format: Artikel
Sprache:eng
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Zusammenfassung:A barrelene derivative fragments to afford benzene and trappable 1,2,3-tricyanocyclopropene. The barrelene anion fragments more easily to liberate benzene and the 1,2,3-tricyanocyclopropenyl anion, which is not trappable or stable in solution. However, the major thermal product from the barrelene anion is a rearranged allyl anion that is formed by disrotatory cleavage of the cyclopropyl ring, a formally Woodward−Hoffmann-forbidden process. Several proposals are offered to rationalize this forbidden rearrangement.
ISSN:1523-7060
1523-7052
DOI:10.1021/ol034997x