New anionic rhodium complexes as catalysts for the reduction of acetophenone and its derivatives
| Autor: | Hieronim Maciejewski, Magdalena Jankowska-Wajda, Olga Bartlewicz |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Ketone Reducing agent Hydrosilylation General Chemical Engineering chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Rhodium chemistry.chemical_compound chemistry Pyridine Polymer chemistry Imidazole 0210 nano-technology Acetophenone |
| Zdroj: | RSC Advances. 9:711-720 |
| ISSN: | 2046-2069 |
| Popis: | New anionic rhodium(III) complexes, obtained by a simple reaction of RhCl3 with organic chlorides (derivatives of imidazole and pyridine), have been employed as catalysts for hydrosilylation (reduction) of acetophenone derivatives. The reactions, in which 1,1,1,3,5,5,5-heptamethyltrisiloxane was a reducing agent, proceeded in a biphasic system because the above complexes are insoluble in the reaction medium. Thereby easy isolation of the complexes from post-reaction mixtures was possible after reaction completion. This is the first example of the application of rhodium complexes of this type as catalysts for ketone reduction. The complexes have shown high activity and enabled obtaining the hydrosilylation product in a very short time and in the range of low concentrations (0.1 mol%). By using FT-IR in situ analysis that enables measuring product concentrations in real time, a comparison has been made of the catalytic activity for hydrosilylation of acetophenone and methoxyacetophenone isomers shown by four rhodium complexes ([C+][RhCl4−]) differing in cations and the most effective catalyst for this process has been distinguished. |
| Databáze: | OpenAIRE |
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