Oxidative amidation of benzaldehydes and benzylamines withN-substituted formamides over a Co/Al hydrotalcite-derived catalyst
| Autor: | Gunjan P. Deshmukh, Kalidas B. Rasal, Shyam Sunder R. Gupta, Lakshmi Kantam Mannepalli, Akhil V. Nakhate |
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| Rok vydání: | 2017 |
| Předmět: |
Hydrotalcite
010405 organic chemistry Chemistry General Chemistry Powder xrd Oxidative phosphorylation 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Adsorption X-ray photoelectron spectroscopy Materials Chemistry Organic chemistry Oxidative coupling of methane Formamides |
| Zdroj: | New Journal of Chemistry. 41:15268-15276 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c7nj03123h |
| Popis: | The present work describes a highly efficient synthetic strategy for amides via oxidative coupling of benzaldehydes or benzylamines with N-substituted formamides using a heterogeneous Co/Al hydrotalcite-derived catalyst in the presence of TBHP. A series of Co/Al hydrotalcite-derived catalysts (Cat-2, Cat-3, and Cat-4 with the Co2+/Al3+ molar ratio in the synthesis mixture as 1/1, 2/1 and 3/1) have been prepared by a simple co-precipitation method and characterized using powder XRD, XPS, FEG-SEM, EDS, FT-IR, DTG-TGA and N2 physical adsorption techniques. Among the as-prepared catalysts, Cat-3 exhibited excellent catalytic activity towards the direct amidation of benzaldehydes as well as benzylamines bearing various substituents into the corresponding amides at 100 °C using TBHP as an oxidant. The mechanistic investigation of the amidation reaction revealed that the reaction follows a radical pathway. Furthermore, the catalyst is easily separable and recyclable without considerable loss in catalytic activity. |
| Databáze: | OpenAIRE |
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