Journal
GREEN CHEMISTRY
Volume 21, Issue 7, Pages 1757-1768Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8gc03909g
Keywords
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Funding
- MHRD, India
- Science and Engineering Research Board [EMR/2016/004016]
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meso-Tetrakis(3,5-dimethoxyphenyl)porphyrinatooxidovanadium (1) and beta-octabromo-meso-tetrakis(2,6-dibromo-3,5-dimethoxyphenyl)porphyrinatooxidovanadium (2) were synthesized in excellent yields. The synthesized oxidovanadium(IV) porphyrin complexes were characterized by various spectroscopic methods such as UV-Vis, FT-IR, EPR and MALDI-TOF mass spectrometry, as well as by single crystal X-ray crystallography. The acetonitrile coordinated porphyrin 1 is relatively planar whereas 2 is highly nonplanar as shown by their crystal structures and also by electrochemical studies. Selective epoxidation studies of alkenes were successfully carried out in CH3CN/H2O as the solvent mixture at ambient temperature resulting in very high TOF numbers (12 227-14 347 h(-1) for 2) even with low catalyst loadings. Remarkably, 2 biomimics the vanadium bromoperoxidase (VBrPO) enzyme with extremely high TOF values (83 333-87 719 h(-1)) for the oxidative bromination of thymol and some other phenols. Both the catalysts were successfully recovered at the end of the reactions, indicating their viability and industrial applicability.
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