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Kandil, Samir S.; El‐Hefnawy, G. B.; Bakr, Eman A.; El-Ezz, A. Z. Abou

doi:10.1023/a:1022968604281

Cited by 29 publications

(14 citation statements)

References 21 publications

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“…The complex showed a characteristic frequency m Cu-Cl at 354 cm -1 [39]. In the complex, bands at 628 cm -1 and 530 cm -1 were assigned to m Cu-O and m Cu-N stretching frequencies, respectively [40,41].…”

Section: Resultsmentioning

confidence: 99%

Olefin epoxidation with tert-butyl hydroperoxide catalyzed by functionalized polymer-supported copper(II) Schiff base complex

et al. 2011

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A new polymer-supported Cu(II) Schiff base complex has been synthesized and characterized by elemental (including metal) analysis, FT-IR spectroscopy, UV-Vis diffuse reflectance spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The catalytic performance of this complex was evaluated in the epoxidation of styrene in acetonitrile/N,N-dimethylformamide (9:1) mixture with 70% tert-butyl hydroperoxide as an oxidizing agent under liquid phase reaction conditions for selective synthesis of styrene oxide. Suitable reaction conditions have been optimized by considering the effects of various reaction parameters such as temperature, reaction time, solvent, oxidant, catalyst amount, and styrene to hydroperoxide molar ratio for the maximum conversion of styrene as well as selectivity of styrene oxide. We have also investigated the epoxidation reaction of various olefins under the optimized reaction conditions. Comparison between catalytic activities of the polymer-supported Cu(II) Schiff base complex and its homogeneous analogue showed that the polymer-supported catalyst was more active. This heterogeneous complex was reused for five times. The selectivity of the heterogeneous catalyst does not change even after five times of reusing.

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Section: Resultsmentioning

confidence: 99%

Olefin epoxidation with tert-butyl hydroperoxide catalyzed by functionalized polymer-supported copper(II) Schiff base complex

et al. 2011

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“…This band can be considered as a mainly metal-to-ligand charge transfer transition containing some d-d transitions. Shoulders on the charge transfer band are attributed to d-d transitions [24]. The copper(II) complex exhibits a broad band in the (500-700 nm) range assigned to the charge transfer transition.…”

Section: Magnetic Moments and Electronic Spectramentioning

confidence: 95%

Copper(II), nickel(II), cobalt(II) and zinc(II) complexes of 2-[2-(6-methylbenzothiazolyl)azo]-5-dimethylaminobenzoic acid: synthesis, spectral, thermal and molecular modelling studies

Garg

Sharma

Kundra

2005

Transition Met Chem

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Complexes of copper(II), nickel(II), cobalt(II), and zinc(II) with 2-[2-(6-methylbenzothiazolyl)azo]-5-dimethylaminobenzoic acid have been prepared and characterized by elemental analysis, vibrational spectra, magnetic susceptibility measurements, conductance measurements and e.p.r. spectra. Stability constants have been evaluated potentiometrically. Electronic spectra, magnetic susceptibility measurements and molecular modeling studies support a distorted square planar geometry around the metal ions. Vibrational spectra indicate the coordination of the azo group, nitrogen of benzothiazole, the carboxylate anion and the acetate ion on complexation with the metal ion. All complexes are found to be monomers. The stability of the complexes follow the order: copper(II) > nickel(II) > cobalt(II) > zinc(II).

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“…This could be attributed to a shift in free C-O stretching as a result of coordination of phenolic oxygen with copper metal [38]. In addition, the bands at 621, 533 and 548 cm -1 may be assigned to the Cu-O, Cu-N azo and Cu-N pyridine [39][40][41] stretching vibration respectively. In this catalyst a medium intensity band observed at 1318 cm -1 suggests the monodentate coordination of the acetate groups [42].…”

Section: Characterization Of the Cu-par Catalystmentioning

confidence: 95%

An Efficient Recyclable Polymer Supported Copper(II) Catalyst for C–N Bond Formation by N-Arylation

Islam

Mondal

et al. 2011

Catal Lett

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Untitled

Cited by 29 publications

References 21 publications

Olefin epoxidation with tert-butyl hydroperoxide catalyzed by functionalized polymer-supported copper(II) Schiff base complex

Olefin epoxidation with tert-butyl hydroperoxide catalyzed by functionalized polymer-supported copper(II) Schiff base complex

Copper(II), nickel(II), cobalt(II) and zinc(II) complexes of 2-[2-(6-methylbenzothiazolyl)azo]-5-dimethylaminobenzoic acid: synthesis, spectral, thermal and molecular modelling studies

An Efficient Recyclable Polymer Supported Copper(II) Catalyst for C–N Bond Formation by N-Arylation

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