scholarly journals Mesoporous Silica-Supported Sulfonyldiamine Ligand for Microwave-Assisted Transfer Hydrogenation

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Shaheen M. Sarkar ◽  
Md. Eaqub Ali ◽  
Md. Shaharul Islam ◽  
Md. Lutfor Rahman ◽  
S. S. Rashid ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Significant Loss ◽  
Transfer Hydrogenation ◽  
High Catalytic Activity ◽  
Efficient Catalyst ◽  
Microwave Assisted ◽  
Ru Complex ◽  
Simple Filtration ◽  
Diamine Ligands

N-Sulfonyl-1,2-diamine ligands, derived from 1,2-diaminocyclohexane and 1,2-diaminopropane, were immobilized onto mesoporous SBA-15 silica. The SBA-15-supported sulfonyldiamine-Ru complex was preparedin situunder microwave heating at 60 W for 3 min. The prepared sulfonyldiamine-Ru complex was used as an efficient catalyst for the transfer hydrogenation of ketones to the corresponding secondary alcohols. The heterogeneous complex showed extremely high catalytic activity with 99% conversion rate under microwave heating condition. The complexes were regenerated by simple filtration and reused two times without significant loss of activity.

Microwave-Assisted Heterogeneous Transfer Hydrogenation of Ketones

2007 ◽  
Vol 124-126 ◽  
pp. 1785-1788 ◽  
Author(s):  
M.S. Sarkar ◽  
Myung Jong Jin
Keyword(s):  
Silica Gel ◽  
Hydrogen Transfer ◽  
Transfer Reaction ◽  
Transfer Hydrogenation ◽  
Efficient Catalyst ◽  
Efficient Procedure ◽  
Microwave Assisted ◽  
Hydrogen Transfer Reaction ◽  
Ru Complex

A first and efficient procedure has been developed for microwave-assisted transfer hydrogenation of ketones. Silica gel-supported ligand 2 has been prepared for the transfer hydrogenation. This immobilized ligand-Ru complex acted as an efficient catalyst for the hydrogen transfer reaction of ketones. The MW-assisted reactions using the supported ligand 2 could reach completion within 20~40 min.

Nitrogen-enriched porous carbon supported Pd-nanoparticles as an efficient catalyst for the transfer hydrogenation of alkenes

2018 ◽  
Vol 42 (20) ◽  
pp. 16823-16828 ◽  
Author(s):  
Jie Li ◽  
Xin Zhou ◽  
Ning-Zhao Shang ◽  
Cheng Feng ◽  
Shu-Tao Gao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Porous Carbon ◽  
Pd Nanoparticles ◽  
Transfer Hydrogenation ◽  
High Catalytic Activity ◽  
Efficient Catalyst ◽  
Supported Pd

Well-dispersed Pd nanoparticles supported on nitrogen-enriched porous carbon were prepared and this material displayed excellent catalytic activity for the transfer hydrogenation of alkenes. The Pd@NPC catalyst exhibited high catalytic activity and stability for the hydrogenation of alkenes.

scholarly journals Phenylboronic Acid/CuSO4 as an Efficient Catalyst for the Synthesis of 1,4-Disubstituted-1,2,3-Triazoles from Terminal Acetylenes and Alkyl Azides

2017 ◽  
Vol 59 (2) ◽  
Author(s):  
Heraclio López-Ruiz
Keyword(s):  
Microwave Heating ◽  
Room Temperature ◽  
Phenylboronic Acid ◽  
Terminal Alkynes ◽  
Efficient Catalyst ◽  
Alkyl Azides ◽  
Terminal Acetylenes

<p>The synthesis of 1,4-disubstituted-1,2,3-triazoles from alkyl azides and terminal alkynes at room temperature and under microwave heating was attained using Cu(I), generated <em>in-situ </em>from copper(II) sulfate and phenylboronic acid, as catalyst. Twelve new triazoles were obtained in moderate to good yields (53-98%), and the products were obtained by crystallization from the mixture reaction without further purification.</p>

Efficient, microwave-assisted intramolecular 1,3-dipolar cycloadditions of oximes and N-methylnitrones derived from o-alkenylmethoxy-acetophenones

2005 ◽  
Vol 83 (3) ◽  
pp. 260-265 ◽  
Author(s):  
Surinderjit Singh ◽  
M PS Ishar ◽  
Gajendra Singh ◽  
Rajinder Singh
Keyword(s):  
Microwave Irradiation ◽  
Microwave Heating ◽  
Reaction Times ◽  
Solvent Free ◽  
Dipolar Cycloadditions ◽  
Microwave Assisted ◽  
Solvent Free Conditions ◽  
A Minor ◽  
Acetophenone Oxime

Contrary to literature reports, the o-allyloxy- and crotyloxy-acetophenone-oximes (2a, 2b) are transformed to nitrones, which undergo regio- and stereoselective intramolecular 1,3-dipolar cycloadditions, both on microwave heating under solvent free conditions and refluxing in toluene, to afford novel cycloadducts (5a, 5b); the oxazepine-N-oxide (3a) reported to be formed in 98% yield was obtained only as a minor product (~10%). However, o-cinnamyloxy-acetophenone-oxime (2c) under similar conditions undergoes intramolecular N-alkylation to afford nitrone (3c). The reactions carried out under microwave irradiation are cleaner, require shorter reaction times, and have higher yields. Corresponding intramolecular 1,3-dipolar cycloadditions of N-methylnitrones (B), generated in situ from o-alkenylmethoxy-acetophenones (1a–1c) and N-methylhydroxylamine under solvent-free microwave irradiation conditions, are completely regio- and stereoselective, require much shorter reaction times, and afford adducts (4a–4c) in higher yields, as compared with their thermal counterparts.Key words: cycloadditions, nitrones, oximes, o-alkenylmethoxy-acetophenones, microwave, isoxazolidines.

Zirconium(IV) 4-sulphophenylethyliminobismethylphosphonate as an efficient and reusable catalyst for one-pot synthesis of 3,4-dihydropyrimidones under solvent-free conditions

2011 ◽  
Vol 65 (6) ◽  
Author(s):  
Xin-Bin Yang ◽  
Xiang-Kai Fu ◽  
Yu Huang ◽  
Ren-Quan Zeng
Keyword(s):  
Catalytic Activity ◽  
Elemental Analysis ◽  
Biginelli Reaction ◽  
Significant Loss ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
One Pot ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Simple Filtration

AbstractZirconium(IV) 4-sulphophenylethyliminobismethylphosphonate (ZSBEDP) was prepared and characterised by elemental analysis, IR, TG-DSC, and XRD. ZSBEDP was found to be an efficient catalyst for the Biginelli reaction of aromatic aldehyde, ethyl acetoacetate, and urea or thiourea under solvent-free conditions so as to give 3,4-dihydropyrimidones in good to excellent yields. The catalyst can be separated by simple filtration and reused without significant loss of its catalytic activity.

scholarly journals An Efficient One-Pot Synthesis of 1,8-Dioxodecahydroacridines Using Silica-Supported Polyphosphoric Acid (PPA-SiO2) under Solvent-Free Conditions

2012 ◽  
Vol 9 (2) ◽  
pp. 504-509 ◽  
Author(s):  
Farid Moeinpour ◽  
Amir Khojastehnezhad
Keyword(s):  
Polyphosphoric Acid ◽  
Ammonium Acetate ◽  
Significant Loss ◽  
One Pot ◽  
Efficient Catalyst ◽  
Aryl Aldehydes ◽  
Solvent Free Conditions ◽  
Short Period ◽  
Simple Filtration ◽  
High Yields

Silica gel–supported polyphosphoric acid (PPA-SiO2) was found to be an efficient catalyst for the synthesis of 1,8-dioxodecahydroacridines via one-pot three-component condensation of aryl aldehydes, dimedone, and ammonium acetate or 4-methyl aniline in high yields, easy workup procedure and short period of times. The catalyst was separated by simple filtration and used in the reaction three times without any significant loss of its activity.

Preparation of Ceramic Honeycomb Filter Supported Zeolite Membrane Modules by Microwave-Assisted In-Situ Crystallization

2006 ◽  
Vol 317-318 ◽  
pp. 697-700 ◽  
Author(s):  
C.D. Madhusoodana ◽  
Rathindra Nath Das ◽  
Yoshikazu Kameshima ◽  
Kiyoshi Okada
Keyword(s):  
Microwave Heating ◽  
Film Formation ◽  
Precursor Solution ◽  
Zeolite Membrane ◽  
Bet Surface Area ◽  
Microwave Assisted ◽  
In Situ Crystallization ◽  
Membrane Modules ◽  
Ceramic Honeycomb

Ceramic honeycomb filter supported zeolite membrane modules were prepared by a novel microwave-assisted in-situ crystallization method. The synthesis was done in two stages; microwave heating of substrates saturated with precursor solution to form a thin layer of zeolite nuclei (seeds) on the porous substrates followed by hydrothermal treatment to crystallize the ZSM-5 zeolite on the substrates. Zeolite formation was significantly enhanced by comparison with the conventional hydrothermal method, as evident from XRD and BET surface area results. The degree of film formation was varied with varying the dipping time of the substrates in the precursor solution prior to microwave heating, thereby controlling film formation inside the pores of the substrates. This new method of seeding using a simple domestic microwave oven was employed to zeolite membrane modules by forming a zeolite film on the thin walls of a honeycomb filter. The permeability of single gases and the separation of mixed gases were evaluated, showing a low pressure-drop and high permeating flux of light molecule gases.

Microwave assisted in situ decoration of a g-C3N4 surface with CdCO3 nanoparticles for visible light driven photocatalysis

2018 ◽  
Vol 42 (8) ◽  
pp. 6322-6331 ◽  
Author(s):  
Devthade Vidyasagar ◽  
Sachin G. Ghugal ◽  
Aditi Kulkarni ◽  
Ashok G. Shende ◽  
Suresh S. Umare ◽  
...  
Keyword(s):  
Visible Light ◽  
Microwave Heating ◽  
Carbon Nitride ◽  
Graphitic Carbon Nitride ◽  
Heating Method ◽  
Inorganic Hybrid ◽  
Microwave Assisted ◽  
Cadmium Carbonate ◽  
Visible Light Driven

Graphitic carbon nitride (g-C3N4) supported cadmium carbonate (CdCO3) as an organic–inorganic hybrid nanophotocatalyst was realised by an in situ microwave heating method.

Pd anchored on C3N4 nanosheets/reduced graphene oxide: an efficient catalyst for the transfer hydrogenation of alkenes

2018 ◽  
Vol 42 (11) ◽  
pp. 9324-9331 ◽  
Author(s):  
Jie Li ◽  
Saisai Cheng ◽  
Tianxing Du ◽  
Ningzhao Shang ◽  
Shutao Gao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Hybrid Composite ◽  
Cost Effective ◽  
Pd Nanoparticles ◽  
Transfer Hydrogenation ◽  
High Catalytic Activity ◽  
Efficient Catalyst ◽  
Reduced Graphene ◽  
Hydrogen Donors

Pd nanoparticles anchored on g-C3N4 NS/rGO were prepared by means of a cost-effective and facile co-assembly approach. The hybrid composite showed high catalytic activity and stability for the hydrogenation of alkenes with FA and HCOONH4 as hydrogen donors.

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.

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