Nanocrystalline Pt-CeO2as an efficient catalyst for a room temperature selective reduction of nitroarenes

2015 ◽  
Vol 17 (2) ◽  
pp. 785-790 ◽  
Author(s):  
Astha Shukla ◽  
Rajib Kumar Singha ◽  
Takehiko Sasaki ◽  
Rajaram Bal
Keyword(s):  
Molecular Hydrogen ◽  
Room Temperature ◽  
Selective Reduction ◽  
Pt Nanoparticles ◽  
Nitro Compounds ◽  
Efficient Catalyst ◽  
Chemoselective Hydrogenation

We have developed 2–5 nm Pt nanoparticles supported on CeO2nanoparticles which shows chemoselective hydrogenation of nitro compounds in the presence of molecular hydrogen with >99.9% conversion and 99% selectivity at room temperature.

Iridium-catalyzed acid-assisted asymmetric hydrogenation of oximes to hydroxylamines

Science ◽  
2020 ◽  
Vol 368 (6495) ◽  
pp. 1098-1102 ◽  
Author(s):  
Josep Mas-Roselló ◽  
Tomas Smejkal ◽  
Nicolai Cramer
Keyword(s):  
Room Temperature ◽  
Asymmetric Hydrogenation ◽  
Selective Reduction ◽  
Building Blocks ◽  
Efficient Catalyst ◽  
Cyclopentadienyl Ligand ◽  
Acidic Conditions ◽  
Asymmetric Hydrogenations ◽  
Metal Catalyzed ◽  
Oxygen Bond

Asymmetric hydrogenations are among the most practical methods for the synthesis of chiral building blocks at industrial scale. The selective reduction of an oxime to the corresponding chiral hydroxylamine derivative remains a challenging variant because of undesired cleavage of the weak nitrogen-oxygen bond. We report a robust cyclometalated iridium(III) complex bearing a chiral cyclopentadienyl ligand as an efficient catalyst for this reaction operating under highly acidic conditions. Valuable N-alkoxy amines can be accessed at room temperature with nondetected overreduction of the N‒O bond. Catalyst turnover numbers up to 4000 and enantiomeric ratios up to 98:2 are observed. The findings serve as a blueprint for the development of metal-catalyzed enantioselective hydrogenations of challenging substrates.

Bimetallic Ni–Pt nanoparticles immobilized on mesoporous N-doped carbon as a highly efficient catalyst for complete hydrogen evolution from hydrazine borane

2020 ◽  
Vol 8 (27) ◽  
pp. 13694-13701 ◽  
Author(s):  
Wei Wang ◽  
Xiaoling Hong ◽  
Qilu Yao ◽  
Zhang-Hui Lu
Keyword(s):  
Hydrogen Evolution ◽  
Room Temperature ◽  
Hydrogen Generation ◽  
Pt Nanoparticles ◽  
Efficient Catalyst ◽  
Highly Efficient

NiPt NPs immobilized on mesoporous N-doped carbon have been facilely synthesized for efficient and complete hydrogen generation from N2H4BH3 solution at room temperature.

Fabrication of Co(OH)2 coated Pt nanoparticles as an efficient catalyst for chemoselective hydrogenation of halonitrobenzenes

2012 ◽  
Vol 377 (1) ◽  
pp. 322-327 ◽  
Author(s):  
Haiyang Cheng ◽  
Xiangchun Meng ◽  
Qiang Wang ◽  
Jun Ming ◽  
Yancun Yu ◽  
...  
Keyword(s):  
Pt Nanoparticles ◽  
Efficient Catalyst ◽  
Chemoselective Hydrogenation

scholarly journals Chemoselective Hydrogenation of Aromatic Nitro Compounds Using Diammonium Hydrogen Phosphite and Commercial Zinc Dust

2008 ◽  
Vol 5 (4) ◽  
pp. 914-917 ◽  
Author(s):  
K. Anil Kumar ◽  
K. S. Shruthi ◽  
Nagaraja Naik ◽  
D. Channe Gowda
Keyword(s):  
Room Temperature ◽  
Zinc Dust ◽  
Nitro Compounds ◽  
The Other ◽  
Hydrogen Donor ◽  
Hydrogen Phosphite ◽  
Aromatic Nitro Compounds ◽  
Chemoselective Hydrogenation ◽  
Aromatic Nitro ◽  
Diammonium Hydrogen

The aromatic nitro compounds are reduced to their corresponding amines at room temperature in good yields by employing diammonium hydrogen phosphite as hydrogen donor and zinc as catalyst. The hydrogenation is fast and selective in the presence of the other sensitive functionalities such as halogens, -OH, -NH2, -OCH3, -CN, -COCH3, -COOH, -COORetc. It was observed that, this system is equally competitive with existing methods.

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.

Pt Nanoparticles Embedded in KOH-Activated Soybean Straw as an Efficient Catalyst toward Benzene Oxidation

2021 ◽  
Vol 60 (9) ◽  
pp. 3561-3571
Author(s):  
Jian Tian ◽  
Lu Wang ◽  
Lixue Qi ◽  
Qun Li ◽  
Daohua Sun ◽  
...  
Keyword(s):  
Pt Nanoparticles ◽  
Benzene Oxidation ◽  
Efficient Catalyst ◽  
Soybean Straw

Au‐Promoted Pt nanoparticles supported on MgO / SBA ‐15 as an efficient catalyst for selective oxidation of glycerol

AIChE Journal ◽  
2021 ◽  
Author(s):  
Yibin Liu ◽  
Minghao Zha ◽  
Hansong Qin ◽  
Shuang Yao ◽  
Xin Zhou ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Pt Nanoparticles ◽  
Efficient Catalyst

Direct conversion of secondary propargyl alcohol into 1,3-di-arylpropanone via DBU promoted redox isomerization and palladium assisted chemoselective hydrogenation in a single pot operation

2021 ◽  
Author(s):  
Rimpa De ◽  
S. Antony Savarimuthu ◽  
Shubhadeep Chandra ◽  
Mrinal K Bera
Keyword(s):  
Direct Conversion ◽  
Single Step ◽  
Propargyl Alcohol ◽  
Efficient Catalyst ◽  
Chemoselective Hydrogenation ◽  
Redox Isomerization

Palladium(II)acetate is found to be an efficient catalyst for the single-step conversion of secondary propargyl alcohol to 1,3-diarylpropanone derivatives under mild basic conditions. The reaction is believed to proceed via...

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