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Allemann, O; Duttwyler, S; Romanato, P; Baldridge, K K; Siegel, J S (2011). Proton-catalyzed, silane-fueled Friedel-Crafts coupling of fluoroarenes. Science, 332(6029):574-577.

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Abstract

The venerable Friedel-Crafts reaction appends alkyl or acyl groups to aromatic rings through alkyl or acyl cation equivalents typically generated by Lewis acids. We show that phenyl cation equivalents, generated from otherwise unreactive aryl fluorides, allow extension of the Friedel-Crafts reaction to intramolecular aryl couplings. The enabling feature of this reaction is the exchange of carbon-fluorine for silicon-fluorine bond enthalpies; the reaction is activated by an intermediate silyl cation. Catalytic quantities of protons or silyl cations paired with weakly coordinating carborane counterions initiate the reactions, after which proton transfer in the final aromatization step regenerates the active silyl cation species by protodesilylation of a quaternary silane. The methodology allows the high-yield formation of a range of tailored polycyclic aromatic hydrocarbons and graphene fragments.

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
DDC:540 Chemistry
Language:English
Date:2011
Deposited On:09 Jan 2012 16:05
Last Modified:05 Jun 2014 13:06
Publisher:American Association for the Advancement of Science (AAAS)
ISSN:0036-8075
Publisher DOI:10.1126/science.1202432
PubMed ID:21527709
Citations:Google Scholar™
Scopus®. Citation Count: 52

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