A structure/catalytic activity study of gold(i)–NHC complexes, as well as their recyclability and reusability, in the hydration of alkynes in aqueous medium

2016 ◽  
Vol 6 (6) ◽  
pp. 1921-1929 ◽  
Author(s):  
Gabriela A. Fernández ◽  
Alicia B. Chopa ◽  
Gustavo F. Silbestri
Keyword(s):  
Catalytic Activity ◽  
Aqueous Medium ◽  
Comparative Studies ◽  
Reaction Times ◽  
Silver Salts

Comparative studies were carried out with the addition of different silver salts. Our results indicate that the bulkier complex is the most effective and that the addition of methanol as co-solvent not only shortens reaction times but also stabilizes the less bulky complexes.

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

Synthesis of sterically hindered N -benzyladamantyl substituted benzimidazol-2-ylidene palladium complexes and investigation of their catalytic activity in aqueous medium

Tetrahedron ◽  
2017 ◽  
Vol 73 (40) ◽  
pp. 5940-5945 ◽  
Author(s):  
Zineb Imene Dehimat ◽  
Aziz Paşahan ◽  
Dahmane Tebbani ◽  
Sedat Yaşar ◽  
İsmail Özdemir
Keyword(s):  
Catalytic Activity ◽  
Aqueous Medium ◽  
Palladium Complexes ◽  
Sterically Hindered

scholarly journals Synthesis, Biological Evaluation and Docking Studies of 1,2,4,5-Tetrasubstituted Imidazoles as Antibacterial Agents: Use of Niobia Supported Heteropoly Tungstate as an Efficient Reusable Catalyst

2021 ◽  
Vol 33 (10) ◽  
pp. 2423-2429
Author(s):  
Aravind Kurnool ◽  
Karunasree Merugu ◽  
Pachipulusu Shravya ◽  
P. Malleswarareddy
Keyword(s):  
Antibacterial Activity ◽  
Catalytic Activity ◽  
Antibacterial Agents ◽  
Ammonium Acetate ◽  
Reaction Times ◽  
Binding Mode ◽  
Docking Studies ◽  
Biological Evaluation ◽  
Reusable Catalyst ◽  
Tetrasubstituted Imidazoles

The synthesis of novel 1,2,4,5-tetrasubstituted imidazoles was carried out in a single molecular motif using niobia supported heteropoly tungstate as a mild and efficient reusable catalyst. The condensation of 3-aryl-1-phenyl-1H-pyrazole-4-carbaldehyde, aromatic amine, benzil, ammonium acetate and heteropoly tungstate supported on niobia was achieved under both conventional and non-conventional conditions. The employed protocol provides significant advantages, as it exhibits a remarkable catalytic activity on recovery, excellent yields and excellent reaction efficacy within short reaction times between 1-2 h (conventional) and 1-3 min (microwave radiation). All the obtained compounds were characterized by means of spectral data and elemental analysis. They were also screened for their antibacterial activity. To predict the binding mode of compounds with glutamine-fructose-6-phosphate transaminase (GlcN6P synthase), docking studies were performed.

Reaction of Coumarin Derivatives with Nucleophiles in Aqueous Medium

2008 ◽  
Vol 63 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Mazaahir Kidwai ◽  
Shweta Rastogi ◽  
Keyword(s):  
Microwave Irradiation ◽  
Aqueous Medium ◽  
Reaction Times ◽  
Parallel Synthesis ◽  
Synthetic Approach ◽  
Coumarin Derivatives ◽  
Green Catalyst ◽  
Unsaturated Ketones ◽  
Water As Solvent

A series of heterocycles was synthesized by the reaction of α,β -unsaturated ketones of benzopyrans or coumarins with various nucleophiles in aqueous medium bearing two points of diversity. Compared to an identical library generated by conventional parallel synthesis, a microwaveassisted procedure dramatically decreased reaction times from hours to minutes, and yields of products and intermediates were improved remarkably. This synthetic approach is ecofriendly in nature which features water as solvent, microwave irradiation, and usage of a “green” catalyst (K2CO3).

scholarly journals A green protocol for synthesis of methylene dioximes promoted by an ionic liquid [bmim]BF4

2009 ◽  
Vol 2009 (8) ◽  
pp. 465-467
Author(s):  
Hongjun Zang ◽  
Yong Zhang ◽  
Meiling Wang ◽  
Bo-Wen Cheng
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Reaction Times ◽  
Green Protocol ◽  
Effective Catalyst

The ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim]BF4, has been demonstrated to be an effective catalyst for synthesis of methylene dioximes. These reactions proceed with excellent yields under shorter reaction times than other reported methods. Furthermore, the ionic liquid [bmim]BF4 can be recycled and reused without loss of catalytic activity.

Diastereoselective Synthesis of Functionalised Trans-Tetrahydrobenzofuran-4-Ones in an Aqueous Medium by using DABCO as an Efficient Catalyst

2017 ◽  
Vol 41 (11) ◽  
pp. 657-660 ◽  
Author(s):  
Mohammad Reza Salari ◽  
Mohammad H. Mosslemin ◽  
Alireza Hassanabadi
Keyword(s):  
Aqueous Medium ◽  
High Purity ◽  
Reaction Times ◽  
Diastereoselective Synthesis ◽  
Efficient Synthesis ◽  
One Pot ◽  
Efficient Catalyst ◽  
Pyridinium Bromide ◽  
Work Up

A one-pot, efficient synthesis of 11 novel 2,3-diacylated trans-tetrahydrobenzofuran-4-one derivatives has been achieved via a three-component condensation of a N-(4-halophenacyl)-pyridinium bromide, a cyclic 1,3-diketone such as 5,5-dimethyl-1,3-cyclohexanedione (dimedone) or cyclohexane-1,3-dione and an arylglyoxal in the presence of catalytic amounts of 1,4-diaza-bicyclo[2.2.2]octane (DABCO) in water under reflux conditions. The attractive features of the method are excellent yields and high purity, short reaction times, easy work-up, and use of an inexpensive and non-toxic catalyst.

Synthesis of Trans-6-(4-Chlorobenzoyl)-7-(Aryl)-1,3-Dimethyl-6,7-Dihydrofuro[3,2-d]Pyrimidine-2,4-Diones Using Choline Hydroxide as an Efficient Catalyst in an Aqueous Medium

2017 ◽  
Vol 41 (3) ◽  
pp. 139-142 ◽  
Author(s):  
Maryam Salari ◽  
Alireza Hassanabadi ◽  
Mohammad H. Mosslemin
Keyword(s):  
Aqueous Medium ◽  
Aromatic Aldehyde ◽  
Reaction Times ◽  
Efficient Synthesis ◽  
One Pot ◽  
Efficient Catalyst ◽  
Excellent Yield ◽  
One Pot Condensation

A green and efficient synthesis of the trans-6-(4-chlorobenzoyl)-7-(aryl)-1,3-dimethyl-6,7-dihydrofuro[3,2-d]pyrimidine-2,4-diones has been achieved via a three-component, one-pot condensation of 2-[2-(4-chlorophenyl)-2-oxoethyl)]isoquinolinium bromide with 1,3-dimethylbarbituric acid and an aromatic aldehyde in the presence of catalytic amounts of choline hydroxide in water under reflux conditions. This gives trans-6-(4-chlorobenzoyl)-7-(aryl)-1,3-dimethyl-6,7-dihydrofuro[3,2-d]pyrimidine-2,4-diones in excellent yield and in short reaction times.

Synthesis of a Water-Soluble Ruthenium Complex and Its Catalytic Activity for Acceptorless Alcohol Dehydrogenation in Aqueous Medium

Synlett ◽  
2018 ◽  
Vol 29 (12) ◽  
pp. 1644-1648 ◽  
Author(s):  
Senthilkumar Muthaiah ◽  
Anita Bhatia
Keyword(s):  
Catalytic Activity ◽  
Aqueous Medium ◽  
Ruthenium Complex ◽  
Water Soluble ◽  
Catalytic Cycle ◽  
Secondary Alcohols ◽  
Atom Economy ◽  
Hydrogen Acceptor ◽  
Alcohol Dehydrogenation ◽  
Acceptorless Alcohol Dehydrogenation

The synthesis of a ruthenium complex bearing a PN-chelating ligand is described. The complex, in the presence of KOH, enabled the synthesis of ketones from secondary alcohols in the absence of a hydrogen acceptor in aqueous medium. This synthetic protocol, which uses water as the medium, is green and has a high atom economy as it avoids the use of an acceptor and produces hydrogen as the sole ­byproduct. Mechanistic investigations revealed that the catalytic cycle involves a phosphine dissociative pathway.

scholarly journals Solvent-Free Preparation of 1,8-Dioxo-Octahydroxanthenes Employing Iron Oxide Nanomaterials

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2386 ◽  
Author(s):  
Fatemeh Rajabi ◽  
Mohammad Abdollahi ◽  
Elham Sadat Diarjani ◽  
Mikhail G. Osmolowsky ◽  
Olga M. Osmolovskaya ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Product Yields ◽  
Environmentally Sound ◽  
Work Up

In this study, 1,8-dioxo-octahydroxanthenes were prepared employing a simple, effective and environmentally sound approach utilizing an iron oxide nanocatalyst under solventless conditions. The proposed iron oxide nanomaterial exhibited high product yields, short reaction times and a facile work-up procedure. The synthesized catalyst was also found to be highly stable and reusable under the investigated conditions (up to twelve consecutive cycles) without any significant loss in its catalytic activity.

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