Bifunctional zinc and magnesium Schiff-base complexes containing quaternary ammonium side-arm for epoxide/CO2 coupling reaction

2021 ◽  
Author(s):  
Arnut Virachotikul ◽  
Nattiya Laiwattanapaisarn ◽  
Kittipong Chainok ◽  
Khamphee Phomphrai
Keyword(s):  
Schiff Base ◽  
Quaternary Ammonium ◽  
Zinc Complex ◽  
Coupling Reaction ◽  
Schiff Base Complexes ◽  
Iodide Anion

Novel bifunctional zinc and magnesium Schiff-base complexes containing quaternary ammonium halide side-arm were developed. The zinc complex 1Et-I (0.02 mol%) having iodide anion has shown the highest TOF for propylene...

SYNTHESIS, SPECTROSCOPIC INVESTIGATION AND CATALYTIC STUDIES OF NICKEL(II) AROMATIC AZOMETHINE COMPLEXES

2018 ◽  
Vol 80 (2) ◽  
Author(s):  
Shahrul Nizam Ahmad ◽  
Hadariah Bahron ◽  
Amalina Mohd Tajuddin ◽  
Syed Abdul Illah Alyahya Syed Abd Kadir
Keyword(s):  
Schiff Base ◽  
Aryl Halide ◽  
Coupling Reaction ◽  
Schiff Base Complexes ◽  
Sonogashira Reaction ◽  
Schiff Base Ligands ◽  
1H And 13C Nmr ◽  
Spectral Techniques ◽  
Chemical Structures ◽  
Sonogashira Coupling Reaction

Coupling reaction between aryl halide and terminal alkyne in Sonogashira coupling reaction is important due to its extensive application in the resynthesis of natural products, production of drugs, dyes, and polymers. Efforts to increase rate of reaction has involved exploration of new catalysts. The current catalysts such as phosphine-based complexes are costly, air-sensitive and environmentally harmful. Nickel(II) Schiff base complexes were synthesized by reacting aromatic Schiff base ligands 2,2'-((1E,1'E)-(1,2-phenylenebis(azanylylidene))bis(metha-nylylidene))diphenol (L1H), 2,2'-((1E,1'E)-(1,2-phenylenebis(azanylylidene))bis(methanylylidene))bis(4-fluorophenol) (L1F), and 2,2'-((1E,1'E)-(1,2-phenylenebis(azanylylidene))bis-(methanylylidene))bis(4-methylphenol) (L1M) with nickel(II) acetate tetrahydrate to form NiL1H, NiL1F and NiL1M. The chemical structures were elucidated through physicochemical and spectral techniques namely elemental analysis, melting point, FTIR, 1H and 13C NMR, magnetic susceptibility and molar conductivity. All nickel(II) complexes were tested as catalysts in homogenous Sonogashira reaction between iodobenzene and phenylacetylene in DMSO for 12 hours at 140 oC. NiLF, a new nickel(II) complex, converted the highest percentage of iodobenzene (91%) while NiLH and NiLC converted 78% and 83% of iodobenzene, respectively. 

A fascinating Suzuki homo-coupling reaction over anchored gold Schiff base complexes on mesoporous host

2011 ◽  
Vol 342-343 ◽  
pp. 11-17 ◽  
Author(s):  
K.M. Parida ◽  
Sudarshan Singha ◽  
P.C. Sahoo ◽  
Swagatika Sahu
Keyword(s):  
Schiff Base ◽  
Coupling Reaction ◽  
Schiff Base Complexes

An insight into the catalytic activity of palladium Schiff-base complexes towards the Heck coupling reaction: routes via encapsulation in zeolite-Y

2019 ◽  
Vol 48 (42) ◽  
pp. 15942-15954
Author(s):  
Susheela Kumari ◽  
Bidisa Das ◽  
Saumi Ray
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Palladium Complex ◽  
Zeolite Y ◽  
Coupling Reaction ◽  
Schiff Base Complexes ◽  
Heck Coupling ◽  
Guest Complex ◽  
Insight Into ◽  
Reaction Routes

Encapsulation of palladium complex within the supercage of zeolite-Y moulds the guest complex such a way that it exhibits an exciting reactivity towards the Heck coupling by eliminating aggregation and tuning electron density of the metal.

scholarly journals Nanographene Sheet Immobilized Transition Metal Complexes for C-C Coupling Reactions

2018 ◽  
Vol 7 (4.5) ◽  
pp. 431
Author(s):  
Saroja Anuma ◽  
Badekai Ramachandra Bhat
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Graphene Sheet ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Schiff Base Complexes ◽  
Environmentally Benign ◽  
Coupling Reactions ◽  
Cross Coupling Reaction

Transition metal Schiff base complexes covalently immobilized on the surface of amino functionalized graphene sheet to catalyze C-C coupling reaction is reported. Graphene sheet which synthesized using mechanical exfoliation and then by differential oxidative reduction phenomenon of graphite. The schiff base ligand is prepared using aldehyde and amino groups containing compounds which further treated with metal salts to form metal complexes. The as-synthesized metal complexes was then incorporated into amino functionalized nanosheets which are characterized using different spectrochemical techniques. The catalytic investigation of the as-prepared catalyst were done by the cross coupling of aryl halides and aryl boronic acids to form biaryls as product in C-C cross coupling reaction. The yield of the products were high and selective which were analyzed using Gas chromatography technique. The advantage of this catalyst is high stability, recyclability easy recovery of catalyst, environmentally benign and mild reaction condition.  

Two Schiff-base Complexes of Copper and Zirconium Oxide Fabricated on Magnetic Nanoparticles as Practical and Recyclable Catalysts in C-C Coupling Reaction

2020 ◽  
Vol 17 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Masoomeh Naseri
Keyword(s):  
Schiff Base ◽  
Magnetic Nanoparticles ◽  
Zirconium Oxide ◽  
High Efficiency ◽  
Coupling Reaction ◽  
Schiff Base Complexes ◽  
Precipitation Method ◽  
The Stability ◽  
Co Precipitation ◽  
Fe3o4 Mnps

: Fe3O4 magnetic nanoparticles (MNPs) were prepared via a chemical co-precipitation method. Then, the surface of Fe3O4 MNPs was modified by (3-Chloropropyl)trimethoxysilane and then two Schiff-base complexes of zirconium oxide and copper were stabilized on modified Fe3O4 MNPs. These catalysts were characterized using SEM, EDS, WDX, FTIR, XRD, TGA, VSM and AAS techniques. The catalytic activity of these catalysts was described in the carbon-carbon coupling reaction. VSM analysis of these catalysts indicate the high magnetic performance, therefor these catalysts can be recovered by an external magnet and reused for several times without missing in the amount of catalysts. Reusability, excellent yields and high TON values indicate the high efficiency of these catalysts. Leaching of these catalysts was studied by AAS which leaching of copper or zirconium was not observed. Also, the stability of these catalysts was confirmed by characterization of recovered catalysts and comparing with fresh catalysts.

Co(II) and Cu(II) Schiff base complexes of bis(N-(4-diethylamino-2-methylphenyl)-3,5-di-tert-butylsalicylaldimine): Electrochemical and X-ray structural study

2008 ◽  
Vol 19 (5) ◽  
pp. 749-755 ◽  
Author(s):  
Mahmut Ulusoy ◽  
Hasan Karabıyık ◽  
Rafet Kılınçarslan ◽  
Muhittin Aygün ◽  
Bekir Çetinkaya ◽  
...  
Keyword(s):  
Schiff Base ◽  
Structural Study ◽  
Schiff Base Complexes ◽  
X Ray

Functional substituted Cu(II) Schiff base complexes, syntheses, X-ray and theoretical characterizations, and investigations of their polyphenol oxidase- and peroxidase-like activities

2021 ◽  
Vol 1232 ◽  
pp. 129975
Author(s):  
Murat Tuna ◽  
Salih Zeki Yildiz ◽  
Gulnur Arabaci ◽  
Zeynep Denli ◽  
Nagihan Çaylak Delibaş ◽  
...  
Keyword(s):  
Schiff Base ◽  
Polyphenol Oxidase ◽  
Schiff Base Complexes ◽  
X Ray
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