Vanadyl β-tetrabromoporphyrin: synthesis, crystal structure and its use as an efficient and selective catalyst for olefin epoxidation in aqueous medium
| Autor: | Mannar R. Maurya, Tawseef Ahmad Dar, Rasel Mohammad Mian, Reshu Tomar, Muniappan Sankar |
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| Rok vydání: | 2019 |
| Předmět: |
Olefin fiber
Chemistry General Chemical Engineering 02 engineering and technology General Chemistry Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Combinatorial chemistry Porphyrin 0104 chemical sciences Catalysis law.invention chemistry.chemical_compound law 0210 nano-technology Selectivity Electron paramagnetic resonance Single crystal |
| Zdroj: | RSC Advances. 9:10405-10413 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c8ra09825e |
| Popis: | We hereby report the synthesis, characterization and catalytic applications in the epoxidation of alkenes by a vanadyl porphyrin having bulky bromo substituents at the β-positions viz. vanandyltetrabromotetraphenylporphyrin (1). The synthesized porphyrin was characterized by various spectroscopic techniques like UV-visible, FT-IR, EPR, MALDI-TOF mass spectrometry and single crystal X-ray analysis. Porphyrin 1 has a nonplanar structure as indicated by its X-ray structure, DFT and electrochemical studies. 1 was analyzed for its catalytic application in the epoxidation of various alkenes. The catalytic reactions were carried out in CH3CN/H2O mixture in 3 : 1 (v/v) ratio. 1 displayed good efficiency in terms of mild reaction conditions, lower reaction temperature and minimal catalyst amount consumption. 1 exhibited excellent selectivity, high conversion efficiency and huge TOF (7600–9800 h−1) in a significantly low reaction time of 0.5 h. Catalyst 1 was regenerated at the end of various catalytic cycles making it reusable and industrially important. |
| Databáze: | OpenAIRE |
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