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| Abstract: | This paper describes the first use of polystyrene-supported poly(amidoamine) (PAMAM) dendrimers as heterogeneous basic organocatalysts for carbon–carbon bond formation. Polystyrene-supported PAMAM dendrimers of first, second and third generations have been used as reusable base catalysts in Knoevenagel condensations of carbonyl compounds with active methylene compounds. The reactions proceed in short periods of time and with 100% selectivity. This novel catalyst eliminates the use of aromatic and halogenated solvents, as well as complex purification processes. The catalysts can be recycled ten times. |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/1966 |
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| First Exaple of Organocatalysis....pdf | (135.4Kb) |
| Abstract: | Knoevenagel condensation between carbonyl compounds and active methylene compounds as well as three component Mannich reaction between aldehydes, ketones and amines proceeded smoothly in water with good to excellent yield and high selectivity in the presence of zero and first generation poly(amidoamine) (PAMAM) dendrimers. The products and the catalyst were separated by simple biphasic extraction. The catalyst was found to be reusable. |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/1967 |
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| Organocatalysis by poly...pdf | (240.0Kb) |
| Abstract: | This manuscript describes the first example of silver ion complex of a dendritic tetranitrile ligand catalyzed one-pot three component Mannich reaction and 1,5-benzodiazepine synthesis. The catalyst can be separated from the products by a change in the solvent. The catalyst is reusable. |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/1968 |
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| Three Component Mannich.....pdf | (83.59Kb) |
Now showing items 1-3 of 3
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