Palladium nanoparticles embedded over mesoporous TiO2 for chemical fixation of CO2 under atmospheric pressure and solvent-free conditions

2017 ◽  
Vol 41 (21) ◽  
pp. 12937-12946 ◽  
Author(s):  
Resmin Khatun ◽  
Piyali Bhanja ◽  
Paramita Mondal ◽  
Asim Bhaumik ◽  
Debasis Das ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Atmospheric Pressure ◽  
Palladium Nanoparticles ◽  
Room Temperature ◽  
Mesoporous Tio2 ◽  
Solvent Free ◽  
Chemical Fixation ◽  
Solvent Free Conditions ◽  
Wide Range

Pd NPs have been embedded over a mesoporous TiO2 material and showed excellent catalytic activity for the fixation of CO2 onto a wide range of epoxides under atmospheric pressure and at room temperature.

The design of a novel and resistant Zn(PZDC)(ATZ) MOF catalyst for the chemical fixation of CO2 under solvent-free conditions

2019 ◽  
Vol 6 (1) ◽  
pp. 317-325 ◽  
Author(s):  
Yixing Li ◽  
Xiao Zhang ◽  
Ping Xu ◽  
Zimin Jiang ◽  
Jianmin Sun
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Solvent Free ◽  
High Catalytic Activity ◽  
Chemical Fixation ◽  
Acid Base ◽  
Solvent Free Conditions

Novel Zn(PZDC)(ATZ) with Lewis acid–base sites exhibited strong resistance to acids/alkalis and moisture and possessed high catalytic activity for CO2 transformation.

DBU/benzyl bromide: an efficient catalytic system for the chemical fixation of CO2 into cyclic carbonates under metal- and solvent-free conditions

2016 ◽  
Vol 6 (11) ◽  
pp. 3872-3877 ◽  
Author(s):  
Lin Wang ◽  
Koichi Kodama ◽  
Takuji Hirose
Keyword(s):  
Catalytic System ◽  
Benzyl Bromide ◽  
Solvent Free ◽  
Chemical Fixation ◽  
Cyclic Carbonates ◽  
Metal Free ◽  
Solvent Free Conditions ◽  
Wide Range

A simple, mild and inexpensive catalytic system, DBU and benzyl bromide, was developed for the cycloaddition of epoxides to ambient CO2 under metal-free and solvent-free conditions and a wide range of epoxides was converted to the corresponding cyclic carbonates with good to excellent yields (81–95%).

scholarly journals [BPy]HSO4 as an Efficient and Recyclable Catalyst for One-Pot Synthesis of α-Aminophosphonates under Solvent-Free Conditions

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Zhongqiang Zhou ◽  
Yaru Pei ◽  
Lamei Wu
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Recyclable Catalyst ◽  
Solvent Free ◽  
One Pot ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
The One

[BPy]HSO4 was prepared and used as an efficient and recyclable catalyst for the one-pot three-component synthesis of α-aminophosphonates at room temperature under solvent-free conditions with good-to-excellent yields. The workup procedure is very simple, and the catalyst can be reused at least four times without any loss in catalytic activity.

One-pot Synthesis of Novel Thiophene Containing Aminonaphthols using Fe3O4 Nanoparticles as a Recyclable Heterogeneous Catalyst

2021 ◽  
Vol 10 ◽  
Author(s):  
Ganesh Pavale ◽  
M. M. V. Ramana ◽  
Poornima Acharya ◽  
Sarfaraz Shaikh
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Fe3o4 Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Solvent Free ◽  
Precipitation Method ◽  
Synthetic Approach ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Wide Range

Background: Metal oxide and metal oxide nanoparticles are gaining significant importance due to their reusability and wide range of catalytic applications in many organic transformations. Objective: To report simple and efficient Fe3O4 catalyzed one-pot five-component reaction protocol to synthesize novel thiophene containing aminonaphthols under solvent-free conditions. Method: To prepare the Fe3O4 nanoparticles by facile and simple co-precipitation method and surface characterization was done using FT-IR, XRD, BET, SEM, and TEM analysis technique. Aminonaphthol derivatives bearing thiophene moiety were synthesized using Fe3O4 nanoparticles under solvent-free conditions. Results: The prepared nanoparticles are smaller in size (15nm) and can be easily detachable. It can be recycled and reused five times without any significant loss of catalytic activity with excellent yields in a short time. The existing protocol for synthesizing amino naphthol becomes feasible and attractive due to the reusability of the catalyst, excellent catalytic performance, and eco-friendly procedure. Conclusion: In conclusion, Fe3O4 nanoparticles provide a simple, efficient, and greener one-pot five-component synthetic approach to synthesize thiophene containing aminonaphthols. Excellent catalytic activity was perceived in a short reaction time without any co-catalyst or any other activator. Moreover, reusability of catalyst, high yields, and environmentally benign solvent-free condition are vital factors of this protocol.

Preparation and Characterization of a Novel Room Temperature Dicationic Ionic Liquid and its Application in the Synthesis of Xanthenediones Under Solvent-Free Conditions

2018 ◽  
Vol 21 (8) ◽  
pp. 602-608 ◽  
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Acidity Function ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Hammett Acidity Function ◽  
Dicationic Ionic Liquid

Aim and Objective: In the present work, 1, 1’-sulfinyldiethylammonium bis (hydrogen sulfate) as a novel room temperature dicationic ionic liquid was synthesized and used as a catalyst for xanthenediones synthesis. Material and Method: The dicationic ionic liquid has been synthesized using ethylamine and thionyl chloride as precursors. Then, by the reaction of [(EtNH2)2SO]Cl2 with H2SO4, [(EtNH2)2SO][HSO4]2 was prepared and after that, it was characterized by FT-IR, 1H NMR, 13C NMR as well as Hammett acidity function. This dicationic ionic liquid was used as a catalyst for the synthesis of xanthenediones via condensation of structurally diverse aldehydes and dimedone under solvent-free conditions. The progress of the reaction was monitored by thin layer chromatography (ethyl acetate/n-hexane = 3/7). Results: An efficient solvent-free method for the synthesis of xanthenediones has been developed in the presence of [(EtNH2)2SO][HSO4]2 as a powerful catalyst with high to excellent yields, and short reaction times. Additionally, recycling studies have demonstrated that the dicationic ionic liquid can be readily recovered and reused at least four times without significant loss of its catalytic activity. Conclusion: This new dicationic ionic liquid can act as a highly efficient catalyst for xanthenediones synthesis under solvent-free conditions.

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.

Efficient Synthesis of Tetrahydrobenzo[b]pyrans under Solvent‐Free Conditions at Room Temperature

2006 ◽  
Vol 36 (16) ◽  
pp. 2363-2369 ◽  
Author(s):  
Liangce Rong ◽  
Xiaoyue Li ◽  
Haiying Wang ◽  
Daqing Shi ◽  
Shujiang Tu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Solvent Free ◽  
Efficient Synthesis ◽  
Solvent Free Conditions

Synthesis of 1,1-diacetates from Aromatic Aldehydes using Cerium(IV) Sulfate Tetrahydrate as Catalyst under Solvent-free Conditions

2005 ◽  
Vol 2005 (3) ◽  
pp. 171-172 ◽  
Author(s):  
Min Zhang ◽  
Yi-Qun Li
Keyword(s):  
Room Temperature ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Excellent Yield ◽  
Solvent Free Conditions

Aromatic aldehydes can be converted into the corresponding 1,1-diacetates rapidly in the presence of catalytic amounts of Ce(SO4)2·4H2O at room temperature in excellent yield under solvent-free conditions. The catalyst can easily be recovered and reused at least 4 times.

Solid lithium perchlorate as a powerful catalyst for the synthesis of β-aminoalcohols under solvent-free conditions

2005 ◽  
Vol 83 (5) ◽  
pp. 505-507 ◽  
Author(s):  
Najmodin Azizi ◽  
Mohammad R Saidi
Keyword(s):  
Ring Opening ◽  
Room Temperature ◽  
Lithium Perchlorate ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Reaction Proceeds ◽  
Ring Opening Of Epoxides ◽  
Neutral Conditions ◽  
Hindered Amines ◽  
Short Times

Lithium perchlorate catalyzed the ring opening of epoxides with amines to provide the corresponding β-aminoalcohols in excellent yields with high regioselectivity. The reaction proceeds rapidly under mild and neutral conditions and worked well with primary, secondary, aliphatic, aromatic, and hindered amines in short times at room temperature, in the absence of solvent.Key words: epoxide, lithium perchlorate, β-aminoalcohols, solvent-free.

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