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The Fritsch-Buttenberg-Wiechell rearrangement, named for Paul Ernst Moritz Fritsch, Wilhelm Paul Buttenberg, and Heinrich G. Wiechell, is a chemical reaction whereby a 1,1-diaryl-2-bromo-alkene rearranges to a 1,2-diaryl-alkyne by reaction with a strong base such as an alkoxide.[1][2][3] [4]
This rearrangement is also possible with alkyl substituents.[5]
Contents |
Reaction Mechanism
The strong base deprotonates the vinylic hydrogen, which after alpha-elimination forms a vinyl carbene. A 1,2-aryl migration forms the desired product, the 1,2-diaryl-alkyne.
Scope
One study explored this reaction for the synthesis of novel polyynes [6] [7]:
References
- ^ Paul Fritsch (1894). "Ueber die Darstellung von Diphenylacetaldehyd und eine neue Synthese von Tolanderivaten". Justus Liebig's Annalen der Chemie 279 (3): 319–323. doi:.
- ^ Buttenberg, W. P. (1894). "Condensation des Dichloracetals mit Phenol und Toluol". Justus Liebig's Annalen der Chemie 279 (3): 324–337. doi:.
- ^ Wiechell, H. (1894). "Condensation des Dichloracetals mit Anisol und Phenetol". Justus Liebig's Annalen der Chemie 279 (3): 337–344. doi:.
- ^ Köbrich, G. (1965). "Eliminations from Olefins". Angewandte Chemie International Edition 4: 49–68. doi:.
- ^ Rezaei, H.; Yamanoi, S.; Chemla, F.; Normant, J. F. (2000). "Fritsch-Buttenberg-Wiechell Rearrangement in the Aliphatic Series". Org. Lett. 2 (4): 419–421. doi:.
- ^ One-Pot Formation and Derivatization of Di- and Triynes Based on the Fritsch-Buttenberg-Wiechell Rearrangement Thanh Luu, Yasuhiro Morisaki, Nina Cunningham, and Rik R. Tykwinski J. Org. Chem. 2007, 72, 9622-9629 doi:10.1021/jo701810g
- ^ The metal acetylide intermediate is captured by electrophile methyl iodide. The reaction product is a biomolecule found in for instance Bidens pilosa
See also
Wikipedia content modification information:
- This page was last modified on 10 August 2008, at 20:50.
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