Polymer and Silica Supported Tridentate Schiff Base Vanadium Catalysts for the Asymmetric Oxidation of Ethyl Mandelate – Activity, Stability and Recyclability

Shiels, Rebecca A.; Venkatasubbaiah, Krishnan; Jones, Christopher W.

doi:10.1002/adsc.200800486

Cited by 43 publications

(13 citation statements)

References 37 publications

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“…In the FT‐IR spectra from 3300 to 3600 cm −1 region, we can observed a peak intensity difference between Schiff base ligand and vanadium complex which may confirm the coordination of vanadium metal ion to the ligand through the carboxylic –OH group. Again, a weak peak observed at 980 cm −1 due to V=O bond stretching vibration …”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Studies of Heterogeneous Oxo‐Vanadium(IV) Schiff base Catalyst for Activation of Benzylic C‐H bonds of Alkanes

et al. 2016

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Here, polymer grafted vanadium(IV) Schiff base catalyst was prepared and applied in the oxidation of benzylic C‐H bonds of alkanes. The solid complex was characterized by some modern techniques i. e. FT‐IR, TGA, SEM‐EDX and solid state UV‐Vis spectroscopy (DRS). This heterogeneous complex showed excellent activity for the oxidation of toluene to benzaldehyde using 30% H2O2 as an oxidantin acetonitrile (ACN) medium at 70oC. This vanadium catalyst was also active for the oxidation of various substituted toluenes. It showed good conversion as well as selectivity for the production of aldehydes from alkanes. The reported catalyst was easily recovered and reused for at least eight times with similar activity.

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Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Studies of Heterogeneous Oxo‐Vanadium(IV) Schiff base Catalyst for Activation of Benzylic C‐H bonds of Alkanes

et al. 2016

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“…Peak at 1396 cm -1 may be due to P-O stretching vibration 39 . Peak at 970 cm -1 is due to stretching vibration of V=O in the infrared spectrum 40 . The band at 436 cm -1 arises due to P-O bending vibrations.…”

Section: Resultsmentioning

confidence: 99%

A novel vanadium n-propylamino phosphate catalyst: synthesis, characterization and applications

et al. 2012

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A novel, lamellar type Vanadium n-propylamino phosphate catalyst is synthesized and characterized by using various physicochemical techniques such as Powder X-ray diffraction, Scanning electron microscopy/Energy dispersive X-ray analysis, Thermogravimetry/Differential thermal analysis, Fourier transform Infrared analysis, Electron spin resonance spectroscopy, Ultraviolet -Visible Diffuse reflectance spectroscopy, X-ray Photoelectron spectroscopy, 31 P Magic angle spinning Nuclear Magnetic Resonance spectroscopy and Catalytic applications toward Octahydroquinazolinone synthesis. It is found that the n-propylamine is present as sandwich between Vanadyl phosphate layers. Most of the Vanadium is present as V 4+ ions in tetrahedral co-ordination. Vanadium n-propylamino phosphate catalyses Octahydroquinazolinone synthesis more effeciently and the optimum conditions required for Octahydroquinazolinone synthesis are, Benzaldehyde (2 mmol), Dimedone (2 mmol), Urea (4 mmol), Methanol + Water (1:1, 5 mL) and Catalyst (0.05 g). A plausible mechanism is also proposed.

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“…Its good catalytic activity, as well as its interesting sorption, optical, electrochemical and magnetic properties, are well documented in the literature 1 . Since the discovery of vanadate-25 dependent enzymes from various algae 2 and terrestrial fungi 3 , the coordination chemistry of this element has received increasing interest.…”

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confidence: 85%

M(C6H16N3)2(VO3)4 as heterogeneous catalysts. Study of three new hybrid vanadates of cobalt(ii), nickel(ii) and copper(ii) with 1-(2-aminoethyl)piperazonium

et al. 2011

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Three new hybrid vanadates have been synthesized under hydrothermal conditions with the formula M(C 6 H 16 N 3 ) 2 (VO 3 ) 4 , where M= Co(II), Ni(II) and Cu(II). The structural analyses show that the phases are isostructural and crystallize in the monoclinic space group P2 1 /c. These compounds show a two-10 dimensional crystal structure, with sheets composed of [VO 3 ]  n n chains and metal centres octahedrically coordinated, chelated by two 1(2-aminoethyl)pyperazonium ligands. The thermal study reveals that copper containing phase is less stable than cobalt and nickel containing ones. The IR spectra of the three phases are very similar, with little differences in the inorganic bond region of the copper containing phase. The UV-visible spectra show that the cobalt(II) and the nickel(II) are in slightly distorted 15 octahedral environments. The catalytic tests show that the phases act as heterogeneous catalysts for the selective oxidization of alkyl aryl sulfides, with both H 2 O 2 and tert-butylhydroperoxide as oxidizing agents. The influence of the steric hindrance in the kinetic profile had been studied. The catalytic reactions induce the partial amorphization of the phases.

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Polymer and Silica Supported Tridentate Schiff Base Vanadium Catalysts for the Asymmetric Oxidation of Ethyl Mandelate – Activity, Stability and Recyclability

Cited by 43 publications

References 37 publications

Synthesis, Characterization and Catalytic Studies of Heterogeneous Oxo‐Vanadium(IV) Schiff base Catalyst for Activation of Benzylic C‐H bonds of Alkanes

Synthesis, Characterization and Catalytic Studies of Heterogeneous Oxo‐Vanadium(IV) Schiff base Catalyst for Activation of Benzylic C‐H bonds of Alkanes

A novel vanadium n-propylamino phosphate catalyst: synthesis, characterization and applications

M(C6H16N3)2(VO3)4 as heterogeneous catalysts. Study of three new hybrid vanadates of cobalt(ii), nickel(ii) and copper(ii) with 1-(2-aminoethyl)piperazonium

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