Alkaline–modified montmorillonite K10: an efficient catalyst for green condensation reaction of aromatic aldehydes with active methylene compounds
| Autor: | Manef Chtourou, Achraf Lahyani, Mahmoud Trabelsi |
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| Rok vydání: | 2018 |
| Předmět: |
010405 organic chemistry
010402 general chemistry Condensation reaction 01 natural sciences Catalysis 0104 chemical sciences law.invention chemistry.chemical_compound Montmorillonite chemistry law Organic chemistry Stereoselectivity Knoevenagel condensation Physical and Theoretical Chemistry Crystallization Methylene Efficient catalyst |
| Zdroj: | Reaction Kinetics, Mechanisms and Catalysis. 126:237-247 |
| ISSN: | 1878-5204 1878-5190 |
| DOI: | 10.1007/s11144-018-1495-9 |
| Popis: | An efficient and reusable catalyst, alkaline–modified Montmorillonite K10, has been developed and used in the Knoevenagel condensation. A series of condensation reactions based on ultrasound irradiation of different types of active methylene compounds and a variety of aromatic aldehydes showed the high efficiency of the prepared catalyst. This protocol has notable advantages, such as being eco-friendly, the ease of the work-up and reuse of the catalyst. The isolated compounds were synthesized in high yields (83–100%) in a short reaction time and were obtained, after crystallization, in pure form (IR, NMR and GC) without further purification. When ethyl cyanoacetate was used as active methylene compound, the reaction is highly stereoselective with only E geometry. |
| Databáze: | OpenAIRE |
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