Direct C–H Arylation of Heteroarenes with Copper Impregnated on Magnetite as a Reusable Catalyst: Evidence for CuO Nanoparticle Catalysis in Solution
| Autor: | Nadja Möller, Andreas Schäfer, Kathryn M. Chepiga, Suhelen Vásquez-Céspedes, Frank Glorius |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
010405 organic chemistry Inorganic chemistry Oxide chemistry.chemical_element Nanoparticle General Chemistry 010402 general chemistry 01 natural sciences Copper Catalysis Dissociation (chemistry) 0104 chemical sciences chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Counterion Magnetite |
| Zdroj: | ACS Catalysis. 6:5954-5961 |
| ISSN: | 2155-5435 |
| Popis: | A reusable copper-based catalyst system was employed for the direct arylation of electron-rich heteroarenes. Under mild and operationally simple reaction conditions good yields and selectivities were obtained using diaryliodonium salts as coupling partners. A combination of experimental methods including kinetic studies, filtration tests, and a series of analytical tools (TXRF, ICP-MS, SEM, XPS, TEM, EFTEM) provide evidence for catalytically active soluble nanoparticles formed from an amorphous heterogeneous precursor. Mechanistic studies hint at a redox-neutral process which promotes counterion dissociation from the diaryliodonium salt by a copper(II) oxide species. |
| Databáze: | OpenAIRE |
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