Solvent-free selective oxidation of alcohols with tert-butyl hydroperoxide catalyzed by palladium(II) isatin Schiff base complex supported into three-dimensional mesoporous silica KIT-6
| Autor: | Mohammad Sabet, Samira Saeednia, Davoud Mousavi, Mehdi Hatefi Ardakani |
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| Rok vydání: | 2020 |
| Předmět: |
Schiff base
010405 organic chemistry Isatin chemistry.chemical_element General Chemistry Mesoporous silica 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Benzyl alcohol Alcohol oxidation tert-Butyl hydroperoxide Nuclear chemistry Palladium |
| Zdroj: | Research on Chemical Intermediates. 47:1105-1121 |
| ISSN: | 1568-5675 0922-6168 |
| DOI: | 10.1007/s11164-020-04319-0 |
| Popis: | In this work, the catalytic activity of a palladium(II) isatin Schiff base complex immobilized into mesoporous silica KIT-6 (Pd-isatin Schiff base@KIT-6) was studied for the oxidation of different alcohols with tert-butyl hydroperoxide (TBHP, 70% aqueous solution) as an oxidant under solvent-free conditions. To find the suitable reaction conditions, the effect of essential factors including the solvent, temperature, catalyst amount and kind of oxidant on the oxidation of benzyl alcohol was explored. The results showed that in this catalytic system, the corresponding aldehydes and ketones were obtained with high to excellent yields at 50 °C without the formation of carboxylic acids as by-products. The catalyst was easily recovered by simple filtration and reused in five subsequent reaction cycles without any significant loss in the catalytic activity. Moreover, the comparison of the Fourier transform infrared (FT-IR) spectrum, X-ray diffraction (XRD) pattern, scanning and transmission electron microscopy (SEM and TEM) images of the used catalyst with a fresh one showed that the structure of the Pd-isatin Schiff base@KIT-6 catalyst remained intact after five times of reuse. |
| Databáze: | OpenAIRE |
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