Catalytic potentials of homodioxo-bimetallic dihydrazone complexes of uranium and molybdenum in a homogeneous oxidation of alkenes

Adam, Mohamed Shaker S.

doi:10.1007/s00706-015-1477-9

Cited by 33 publications

(19 citation statements)

References 55 publications

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“…This could be due to its high stability in the (ep)oxidation processes especially at high temperatures, and its high resistance for oxidation compared with other solvents . The high dielectric constant of acetonitrile could improve the catalytic potential of H 2 O 2 , and also could enhance the electron transfer process in the catalytic cycles, homogeneously . In other solvents (acetone and chloroform as polar organic solvents) and under solvent‐free conditions, the (ep)oxidation yield was good and the catalytic potential of Cu‐PST was little inhibited.…”

Section: Resultsmentioning

confidence: 99%

Catalytic evaluation of copper (II)N‐salicylidene‐amino acid Schiff base in the various catalytic processes

Al-Hussein

Adam

2020

Applied Organom Chemis

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N‐Salicylidene amino acid Schiff base sodium sulfonate salt, as a tridentate dibasic chelating ligand, was obtained from the common condensation of salicylaldehyde‐5‐sodium sulfonate with tyrosine (HPST). The internal formed ligand coordinated to Cu2+ ion in an aqueous media affording new Cu (II)‐complex (Cu‐PST), which characterized by various physico‐chemicals spectral tools. The mononuclear complex was evaluated as a homogeneous and heterogeneous catalyst in the (ep)oxidation protocols of 1,2‐cyclooctene and benzyl alcohol. Heterogeneously, Cu‐PST was immobilized on Fe3O4‐SiO2, as nanoparticles. The heterogeneous catalyst was characterized by infrared, X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, energy‐dispersive spectroscopy, Brunauer−Emmett−Teller and magnetism. Homogeneously, the temperature, solvent and oxidant influences were examined in the catalytic reactions to realize the best reaction conditions. Cu‐catalyst exhibited better catalytic performance in the (ep)oxidation processes homogeneously than that in the heterogeneous phase at 80°C for 2 hr in acetonitrile. Reusability of the homogeneous catalyst was for a maximum of three times in the (ep)oxidation reaction, whereas the heterogeneous catalyst was active for six times. A mechanistic pathway was proposed for both catalysts, comparatively.

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Section: Resultsmentioning

confidence: 99%

Catalytic evaluation of copper (II)N‐salicylidene‐amino acid Schiff base in the various catalytic processes

Al-Hussein

Adam

2020

Applied Organom Chemis

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“…benzyl alcohol, have an interesting feature and impact on the amount of the reaction kinetics and yield of the corresponding carbonyl products, e.g. benzaldehyde, as remarked before for the oxidation processes [63]. The effect of the catalyst was discovered by insertion of different molar ratios of the Cunpap complex to benzyl alcohol in the oxidation process (0.02, 0.05 or 0.10: 1, respectively) using an aqueous H 2 O 2 in acetonitrile at optimized conditions.…”

Section: Effect Of Catalyst Amountmentioning

confidence: 93%

“…9a-c. Different structurally Cu 2+ complexes were subjected to the oxidation of benzyl alcohol by an aqueous H 2 O 2 have an observable impact by their steric effects [63]. This behavior has been widely reported and proved particularly by the electronic spectral scan of the oxidation processes [64.…”

Section: Effect Of Catalyst Amountmentioning

confidence: 99%

“…Scheme 1) in Cubsisnph and Cunpisnph complexes. Furthermore, in Cunpap complex, copper ion surrounded by two coordinated Schiff base ligands, which may block the active sides of Cu 2+ ions for catalysis [63]. In addition, the presence of coordinated water molecules in Cubsisnph and Cunpisnph complexes may improve their catalytic potentials towards benzyl alcohol oxidation by an aqueous H 2 O 2 .…”

Section: Effect Of Catalyst Typementioning

confidence: 99%

“…The solubility of titled complex catalysts may also play an observable role in their catalytic potentials. They are sparingly soluble in dichloromethane and chloroform in which the catalytic ability of the current complex catalysts deactivated and exhibited very low yield of the oxidation process heterogeneously, especially with aqueous H 2 O 2 [63].…”

Section: Effect Of Catalyst Amountmentioning

confidence: 99%

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Some New Nano-sized Mononuclear Cu(II) Schiff Base Complexes: Design, Characterization, Molecular Modeling and Catalytic Potentials in Benzyl Alcohol Oxidation

et al. 2016

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In the present contribution, some novel Cu(II) complexes were synthesized from tri-and tetradentate imine ligands. All the prepared compounds were elucidated by different physicochemical methods. Density Functional Theory calculations were carried out to explain the equilibrium geometry of the bsisnph and npisnph ligands and their Cu(II) complexes. Interaction of the synthesized ligands with Cu(II) affords nano-sized particles via TEM. The catalytic potentials of the prepared complexes has been tested within the oxidation of benzyl alcohol using an environmental friendly terminal oxidant, i.e. H 2 O 2 . The effect of various parameters, e.g. solvents, temperature and amount of catalyst was investigated. A mechanistic pathway of the catalytic oxidation was tentatively described and discussed. Graphical AbstractKeywords Cu(II) Schiff base complexes · TEM · Benzyl alcohol · Density Functional Theory · Catalytic activity · Hydrogen peroxide

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Catalytic activity of nickel(II), copper(II) and oxovanadium(II)‐dihydroindolone complexes towards homogeneous oxidation reactions

Adam

2018

Applied Organom Chemis

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Three novel paramagnetic metal complexes (MH 2 ID) of Ni 2+ , Cu 2+ and VO 2+ ions with 3-hydroxy-3,3'-biindoline-2,2'-dione (dihydroindolone, H 4 ID) were synthesized and characterized by different spectroscopic methods. The ligand (H 4 ID) was synthesized via homocoupling reaction of isatin in presence of phenylalanine in methanol. Complexation of low valent Ni 2+ , Cu 2+ ions and high valent VO 2+ ions with H 4 ID carried out in 1: 2 molar ratios. A comparison in the catalytic potential of paramagnetic complexes of low and high valent metal ion was explored in the oxidation processes of cis-cyclooctene, benzyl alcohol and thiophene by an aqueous H 2 O 2 , as a green terminal oxidant, in the presence and absence of acetonitrile, as an organic solvent, at 85°C. NiH 2 ID, CuH 2 ID and VOH 2 ID show good catalytic activity, i.e. good chemoand regioselectivity. VOH 2 ID has the highest catalytic potential compared to both Ni 2+and Cu 2+ -species in the same homogenous aerobic atmosphere.Catalytic oxidation of other alkenes and alcohols was also studied using NiH 2 ID, CuH 2 ID or VOH 2 ID as a pre-catalyst by an aqueous H 2 O 2 . A mechanistic pathway for those oxidation processes was proposed.

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Catalytic potentials of homodioxo-bimetallic dihydrazone complexes of uranium and molybdenum in a homogeneous oxidation of alkenes

Cited by 33 publications

References 55 publications

Catalytic evaluation of copper (II)N‐salicylidene‐amino acid Schiff base in the various catalytic processes

Catalytic evaluation of copper (II)N‐salicylidene‐amino acid Schiff base in the various catalytic processes

Some New Nano-sized Mononuclear Cu(II) Schiff Base Complexes: Design, Characterization, Molecular Modeling and Catalytic Potentials in Benzyl Alcohol Oxidation

Catalytic activity of nickel(II), copper(II) and oxovanadium(II)‐dihydroindolone complexes towards homogeneous oxidation reactions

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