Oxidative bromination and oxidation of organic substrates catalyzed by bis[2,2'-hydroxyphenylbenzimidazole]Fe(III) complex entrapped in zeolite-Y cavity
| Autor: | Gayathri Virupaiah, Shilpa Eshwar Rao |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Cyclohexane
010405 organic chemistry Renewable Energy Sustainability and the Environment General Chemical Engineering Organic Chemistry Inorganic chemistry Halogenation 010402 general chemistry 01 natural sciences Pollution Ethylbenzene 0104 chemical sciences Saturated and unsaturated compounds Catalysis Inorganic Chemistry chemistry.chemical_compound Fuel Technology chemistry Transition metal Polymer chemistry Selectivity Zeolite Waste Management and Disposal Biotechnology |
| Zdroj: | Journal of Chemical Technology & Biotechnology. 92:2060-2074 |
| ISSN: | 0268-2575 |
| DOI: | 10.1002/jctb.5201 |
| Popis: | BACK GROUND Zeolite encapsulated transition metal complexes have proven to be better catalysts for most of the organic transformations as they share advantages of both homogeneous and heterogeneous catalysts because the complex inside the zeolite cage could move within the cavity at the same time cannot come out of it owing to its size. Hence, various reports claim the application of these encapsulated complexes in various organic transformations. Introduction of bromine into aromatic compounds is an important-fundamental reaction in organic chemistry. On the other hand, oxidations of saturated and unsaturated compounds also find their application in synthesis of fine chemicals. RESULTS The peak positions in cyclic voltammogram of encapsulated complex were unaltered accompanied by increase in current with scan rates substantiating the encapsulation of the complex within the cavity. This complex was catalytically active in presence of H2O2 towards the oxidation of cyclohexane and ethylbenzene. Its catalytic efficiency was examined towards oxidative bromination of organic substrates using KBr at room temperature wherein high para-selectivity was obtained. It displayed better conversion/selectivity than Fe(opbmzl)2NO3 retaining its catalytic activity up to 5 consecutive runs. Plausible mechanisms involving hydro-peroxo intermediate have been proposed. CONCLUSION Zeolite encapsulated Bis[2,2'-hydroxyphenylbenzimidazole]Fe(III) complex behaved as a versatile catalyst for various organic transformations. |
| Databáze: | OpenAIRE |
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