scholarly journals Synthesis, Characterization, and Application of Poly(N,N′-dibromo-N-ethylnaphthyl-2,7-disulfonamide) as an Efficient Reagent for the Synthesis of 2-Arylbenzimidazole and 2-Aryl-1-arylmethyl-1H-1,3-benzimidazole Derivatives

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Vida Saleh ◽  
Ardeshir Khazaei ◽  
Hamid Abizadeh ◽  
Shahnaz Saednia
Keyword(s):  
Heterogeneous Catalyst ◽  
Normal Condition ◽  
Benzimidazole Derivatives ◽  
Molecular Bromine ◽  
Aryl Aldehydes ◽  
Simple Filtration ◽  
Efficient Reagent

The condensation of O-phenylenediamine (OPD) with aryl aldehydes is carried out in acetonitrile using poly(N,N′-dibromo-N-ethylnaphthyl-2,7-disulfonamide) (PBNS) as a novel and heterogeneous catalyst. PBNS has some potential advantages which include ease of separation from the reaction mixture by simple filtration, easy preparation, recoverablility, convenience, and stability under normal condition and also is not dangerous as molecular bromine.

Copper-catalyzed one-pot synthesis of benzimidazole derivatives

2008 ◽  
Vol 86 (11) ◽  
pp. 1044-1051 ◽  
Author(s):  
Hashem Sharghi ◽  
Mona Hosseini-Sarvari ◽  
Fatemeh Moeini
Keyword(s):  
Heterogeneous Catalyst ◽  
Simple Procedure ◽  
Catalytic Reactions ◽  
Environmentally Benign ◽  
Benzimidazole Derivatives ◽  
Good Recovery ◽  
One Pot ◽  
Aryl Aldehydes ◽  
Mild Conditions ◽  
High Yields

A simple, efficient, and environmentally benign method has been developed for the synthesis of 2-substituted benzimidazoles through a one-pot reaction of phenylenediamines with aryl aldehydes in excellent isolated yields under mild conditions using Cu(II) complex as the selective, recyclable, and heterogeneous catalyst at ambient temperature. The Cu(II) complex as a heterogeneous catalyst can be reused in further catalytic reactions, and it was found that its activity remained largely unchanged for eight successive runs. No metal-complex leaching was observed after the consecutive catalytic reactions. The salient features of this method include mild conditions, high yields, simple procedure, and good recovery and reusability of the heterogeneous catalyst.Key words: benzimidazole, o-phenylenediamine, arylaldehydes, heterogeneous catalyst, N,N-bis (2-hydroxyphenyl)pyridine-2,6-dicarboxamide.

scholarly journals Air-stable, recyclable, and time-efficient diphenylphosphinite cellulose-supported palladium nanoparticles as a catalyst for Suzuki–Miyaura reactions

2011 ◽  
Vol 7 ◽  
pp. 378-385 ◽  
Author(s):  
Qingwei Du ◽  
Yiqun Li
Keyword(s):  
Heterogeneous Catalyst ◽  
Palladium Nanoparticles ◽  
Palladium Complex ◽  
Complex Cell ◽  
Reaction Conditions ◽  
Highly Efficient ◽  
Excellent Yield ◽  
Simple Filtration ◽  
Supported Palladium ◽  
Efficient Heterogeneous Catalyst

A diphenylphosphinite cellulose palladium complex (Cell–OPPh2–Pd0) was found to be a highly efficient heterogeneous catalyst for the Suzuki–Miyaura reaction. The products were obtained in good to excellent yield under mild reaction conditions. Moreover, the catalyst could be easily recovered by simple filtration and reused for at least 6 cycles without losing its activity.

Copper Hydrotalcite (Cu-HT) as an Efficient Catalyst for the Hydrogenation of CO2 to Formic Acid

2020 ◽  
Vol 9 (1) ◽  
pp. 59-71
Author(s):  
Minaxi S. Maru ◽  
Parth Patel ◽  
Noor-ul H. Khan ◽  
Ram S. Shukla
Keyword(s):  
Formic Acid ◽  
Heterogeneous Catalyst ◽  
Total Pressure ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Bet Surface Area ◽  
Acid Yield ◽  
Hydrogenation Of Co2 ◽  
Simple Filtration ◽  
Additional Base

: Hydrogenation of CO2 to energy-rich products over heterogeneous metal catalysts has gained much attention due to their commercial applications. Specifically, the first-row transition metal catalysts are very rarely reported and discussed for the production of formic acid from the hydrogenation of CO2. Herein, hydrotalcite supported copper metal has shown activity and efficiency to produce formic acid from the hydrogenation of CO2, without adding any additional base or promoter and was effectively recycled 4 times after separating by simple filtration without compromising the formic acid yield. Hydrotalcite supported copper-based catalyst (Cu-HT) was synthesized through the coprecipitation method and used as a heterogeneous catalyst for the hydrogenation of CO2. The precise copper metal content determined by ICP in Cu-HT is 0.00944 mmol. The catalyst afforded maximum TOF, 124 h-1 under the employed reaction conditions: 100 mg catalyst, 60 °C, 60 bar total pressure of CO2/H2 (1:1, p/p) with 60 mL of mixed methanol:water (5:1, v/v) solvent. Cu-HT catalyst was synthesised and thoroughly characterized by FT-IR, PXRD, SEM, TEM, XPS and BET surface area. The first-order kinetic dependence with respect to the catalyst amount, partial pressures of CO2, and of H2 was observed and a plausible reaction mechanism is suggested. Background: CO2 hydrogenation to energy-rich products over heterogeneous metal catalysts has gained much attention due to their commercial applications. Specifically, the first-row transition metal catalysts are very rarely reported and discussed for the production of formic acid from the hydrogenation of CO2. Objective: he aim is to investigate the heterogeneous catalyst systems, using solid soft base hydrotalcite supported Cu metal-based catalyst for effective and selective hydrogenation of CO2 to formic acid. Methods: The Cu –HT catalyst was synthesized and characterized by FT-IR, PXRD, SEM, TEM, XPS and BET surface area in which the precise copper content was 0.00944 mmol. The Cu-HT catalysed hydrogenation of CO2 was carried out in the autoclave. Results: The Cu-HT catalyst afforded maximum TOF of 124 h-1 under the employed reaction conditions: 100 mg catalyst, 60 °C, 60 bar total pressure of CO2/H2 (1:1, p/p) with 60 mL of mixed methanol: water (5:1, v/v) solvent, without adding any additional base or promoter and was recycled 4 times by simple filtration without compromising the formic acid yield. Formation of formic acid was observed to depend on the amount of the catalyst, partial pressures of CO2 and H2, total pressure, temperature and time. Conclusion: Cu-HT based heterogeneous catalyst was found to be efficient for selective hydrogenation of CO2 to formic acid and was effectively recycled four times after elegantly separating by simple filtration.

Preparation and Characterization of Hollow MgO/SiO2 Nanocomposites and using as Reusable Catalyst for Synthesis of 1H-Isochromenes

2021 ◽  
Author(s):  
Somaye Mohammadi ◽  
Hossein Naeimi
Keyword(s):  
Heterogeneous Catalyst ◽  
Michael Addition ◽  
Room Temperature ◽  
Aldol Reaction ◽  
Reaction Times ◽  
Active Area ◽  
Reusable Catalyst ◽  
Simple Filtration ◽  
Sio2 Nanocomposites

Abstract In the present study, hollow MgO/SiO2 nanocatalyst with great base properties was made. This heterogeneous catalyst was a synthesis in several steps to create a great active area and decrease the density of the catalyst. The base hollow catalyst framework for the reaction of cyclohexanone, malononitrile and benzaldehyde to the synthesis of 1H-isocromene from Michael addition and aldol reaction at room temperature. All the reaction flowing was excellent in the yield of productand reaction times. At the end of the reaction, the nanocatalyst separated by simple filtration and reuse in several runs elsewhere.

scholarly journals Ferric Hydrogensulfate As a Reusable Heterogeneous Catalyst for the Synthesis of 5-Substituted-1H-Tetrazoles and Amides

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Hossein Eshghi ◽  
Seyed Mohammad Seyedi ◽  
Elaheh Rahimi Zarei
Keyword(s):  
Heterogeneous Catalyst ◽  
Carboxylic Acids ◽  
Sodium Azide ◽  
Aromatic Nitriles ◽  
Simple Filtration ◽  
High Yields ◽  
Aqueous Conditions ◽  
Hydrolysis Of ◽  
Substituted 1

Ferric hydrogensulfate catalyzed the synthesis of 5-substituted 1H-tetrazoles via [2 + 3] cycloaddition of nitriles and sodium azide. This method has the advantages of high yields, simple methodology, and easy workup. The catalyst can be recovered by simple filtration and reused delivering good yields. Also, ferric hydrogensulfate catalyzed the hydrolysis of nitriles to primary amides under aqueous conditions. Various aliphatic and aromatic nitriles converted to the corresponding amides in good yields without any contamination with carboxylic acids.

Synthesis and Characterization of AlCl3 Impregnated Molybdenum Oxide as Heterogeneous Nano-Catalyst for the Friedel-Crafts Acylation Reaction in Ambient Condition

2015 ◽  
Vol 15 (10) ◽  
pp. 8243-8250 ◽  
Author(s):  
Arvind H. Jadhav ◽  
Amutha Chinnappan ◽  
Vishwanath Hiremath ◽  
Jeong Gil Seo
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalyst ◽  
Molybdenum Oxide ◽  
Room Temperature ◽  
Solvent Free ◽  
Impregnation Method ◽  
Acylation Reaction ◽  
Reaction Condition ◽  
Nano Catalyst ◽  
Simple Filtration

Aluminum trichloride (AlCl3) impregnated molybdenum oxide heterogeneous nano-catalyst was prepared by using simple impregnation method. The prepared heterogeneous catalyst was characterized by powder X-ray diffraction, FT-IR spectroscopy, solid-state NMR spectroscopy, SEM imaging, and EDX mapping. The catalytic activity of this protocol was evaluated as heterogeneous catalyst for the Friedel-Crafts acylation reaction at room temperature. The impregnated MoO4(AlCl2)2 catalyst showed tremendous catalytic activity in Friedel-Crafts acylation reaction under solvent-free and mild reaction condition. As a result, 84.0% yield of acyl product with 100% consumption of reactants in 18 h reaction time at room temperature was achieved. The effects of different solvents system with MoO4(AlCl2)2 catalyst in acylation reaction was also investigated. By using optimized reaction condition various acylated derivatives were prepared. In addition, the catalyst was separated by simple filtration process after the reaction and reused several times. Therefore, heterogeneous MoO4(AlCl2)2 catalyst was found environmentally benign catalyst, very convenient, high yielding, and clean method for the Friedel-Crafts acylation reaction under solvent-free and ambient reaction condition.

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