| Autor: |
Selvakannan Periasamy, Gunjan P. Deshmukh, Akhil V. Nakhate, Suresh K. Bhargava, Shyam Sunder R. Gupta, Priya S. Samudrala, Mannepalli Lakshmi Kantam |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
ChemistrySelect. 3:8436-8443 |
| ISSN: |
2365-6549 |
| DOI: |
10.1002/slct.201801297 |
| Popis: |
Here we report a highly active and recyclable Cu-Fe based heterogeneous catalytic system for the oxidative coupling of benzyl alcohols as well as benzylamines with N-substituted formamides. The Cu-Fe Metal Oxide (Cu-Fe MO) catalyst was prepared by a co-precipitation method and was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Energy-dispersive X-ray spectroscopy (EDS), Field Emission Gun-Scanning Electron Microscopy (FEG-SEM) and N2 physical adsorption techniques. The catalytic activity of the as-prepared Cu-Fe MO catalyst was evaluated towards amidation reactions and a broad spectrum of aromatic amides have been synthesized in good to moderate yields by oxidative coupling of benzyl alcohols or benzylamines bearing various substituents with N-substituted formamides. The control experiments revealed that the benzyl alcohol or benzylamine gets converted to an acyl radical and on the other side the N-substituted formamides form an aminyl radical in presence of the catalyst and tert-Butyl hydroperoxide (TBHP). Successive coupling of the in-situ generated acyl and aminyl radicals affords the desired product amide. Furthermore, the heterogeneous Cu-Fe MO catalyst recycled for four times towards the amidation of benzyl alcohol and the fidelity of the spent catalyst has been confirmed by XRD analysis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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