Direct Synthesis of Amides from Oxidative Coupling of Benzyl Alcohols and N-substituted Formamides Using a Co–Al Based Heterogeneous Catalyst
| Autor: | Bhalchandra M. Bhanage, Shyam Sunder R. Gupta, Dnyaneshwar D. Subhedar |
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| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
010405 organic chemistry organic chemicals General Chemistry 010402 general chemistry Heterogeneous catalysis 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound Physisorption chemistry X-ray photoelectron spectroscopy Benzyl alcohol Organic chemistry heterocyclic compounds Oxidative coupling of methane Formamides Organometallic chemistry |
| Zdroj: | Catalysis Letters. 148:3102-3111 |
| ISSN: | 1572-879X 1011-372X |
| DOI: | 10.1007/s10562-018-2519-9 |
| Popis: | Present work reports the direct synthesis of amides from oxidative coupling of benzyl alcohols with various N-substituted formamides using a cobalt-hydrotalcite (Co-HT) derived catalyst. The Co-HT derived catalysts (Co-HT-2, Co-HT-3 and Co-HT-4 having Co2+/Al3+ molar ratio in the catalyst preparation mixture as 1/1, 2/1 and 3/1 respectively) were prepare following a co-precipitation method and characterized well by powder XRD, XPS, FEG-SEM, EDS, DTG–TGA, FT-IR and N2 physisorption measurements. A range of functional amides were obtained in good yields from oxidative coupling of various substituted benzyl alcohols and a range of N-substituted formamides using Co-HT-3 catalyst and oxidant TBHP. Mechanistic investigation suggests that the amidation reaction is associated with the formation and coupling of radical species. Furthermore, the Co-HT derived catalyst was easily recoverable and recyclable with retained high catalytic activity towards the oxidative coupling of benzyl alcohol with DMF. |
| Databáze: | OpenAIRE |
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