Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 48, Pages 15833-15839Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201404277
Keywords
density functional methods; gold; homogeneous catalysis; reaction mechanism; Selectfluor
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Funding
- National Natural Science Foundation of China [91127014]
- Welch Foundation [A-1775]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1266022] Funding Source: National Science Foundation
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The pairing of transition metal catalysis with the reagent Selectfluor (F-TEDA-BF4) has attracted considerable attention due to its utility in myriad C - C and C - heteroatom bond-forming reactions. However, little mechanistic information is available for Selectfluor-mediated transition metal-catalyzed reactions and controversy surrounds the precise role of Selectfluor in these processes. We present herein a systematic investigation of homogeneous Au-catalyzed oxidative C - O bond-forming reactions using density functional theory calculations. Currently, Selectfluor is thought to serve as an external oxidant in AuI/ AuIII catalysis. However, our investigations suggest that these reactions follow a newly proposed mechanism in which Selectfluor functions as an electrophilic fluorinating reagent involved in a fluorination/ defluorination cycle. We have also explored Selectfluor-mediated gold-catalyzed homocoupling reactions, which, when cyclopropyl propargylbenzoate is used as a substrate, lead to an unexpected byproduct.
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