A remote coordination booster enhances the catalytic efficiency by accelerating the generation of an active catalyst

2016 ◽  
Vol 52 (16) ◽  
pp. 3384-3387 ◽  
Author(s):  
Suraj K. Gupta ◽  
Joyanta Choudhury
Keyword(s):  
Carbonyl Compounds ◽  
Active Catalyst ◽  
Catalytic Efficiency ◽  
Catalytic Site ◽  
Excellent Performance ◽  
Oxidative Transformation

A RuII(terpy)2 unit incorporated remotely to the catalytic site acts as a “coordination booster” for enhancing the catalytic efficiency to achieve excellent performance in the selective oxidative transformation of alkenes and alkynes to carbonyl compounds.

scholarly journals Magnetic Chitosan-Supported Silver Nanoparticles: A Heterogeneous Catalyst for the Reduction of 4-Nitrophenol

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 839 ◽  
Author(s):  
Hasan ◽  
Shehadi ◽  
Al-Bab ◽  
Elgamouz
Keyword(s):  
Silver Nanoparticles ◽  
Heterogeneous Catalyst ◽  
Active Catalyst ◽  
Low Cost ◽  
Catalytic Efficiency ◽  
Magnetic Chitosan ◽  
X Ray ◽  
Surface Modified ◽  
First Time ◽  
Magnetic Fe3o4

Developing heterogeneous catalyst using chitosan (CS) and magnetic Fe3O4 as support has been remarkably attractive due to their availability, low cost and non-toxicity. In this work, a heterogeneous catalyst (denoted as Fe3O4@CS@MS@Ag) was fabricated by the deposition of silver nanoparticles on magnetic chitosan via an easy and facile modification of its surface with methyl salicylate (MS). The catalyst was characterized using Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). To the best of our knowledge, for the first time, CS decorated Fe3O4 (Fe3O4@CS) has shown the catalytic activity for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in presence of NaBH4. Surface modified magnetic chitosan (Fe3O4@CS@MS) also acts as active catalyst towards the reduction of 4-NP. However, catalytic efficiency has increased fourfold when silver-nanoparticles-deposited magnetic chitosan (Fe3O4@CS@MS@Ag) used as our target catalyst. The catalyst was separated with external magnet after each cycle of catalytic reaction and reused effectively five times with almost 90% efficiency.

Integration of adsorption and catalysis active sites in cobalt iron oxide nanorods for excellent performance Li-S Battery with a wide temperature range

2021 ◽  
Author(s):  
Dingrong Deng ◽  
Xue-Yang Cui ◽  
Xiaoxiang Fan ◽  
Jieqing Zheng ◽  
Xiao-Hong Fan ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Wide Temperature Range ◽  
Active Sites ◽  
Catalytic Site ◽  
Excellent Performance ◽  
Temperature Range ◽  
Oxide Nanorods ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron

Whether Li-S batteries can be worked in a wider temperature range is particularly important. Here, we report a micronano structure CoFe2O4 rods accompanied with both catalytic site (Co) and adsorption...

scholarly journals Palladium(0) Nanoparticles Immobilized onto Silica/Starch Composite: Sustainable Catalyst for Hydrogenations and Suzuki Coupling

2019 ◽  
Vol 14 (3) ◽  
pp. 586
Author(s):  
Ravinderpal Kour Sodhi ◽  
Satya Paul
Keyword(s):  
Electron Microscopy ◽  
Carbonyl Compounds ◽  
Active Catalyst ◽  
Suzuki Coupling ◽  
Environmentally Benign ◽  
Reaction Conditions ◽  
Transmission Electron ◽  
Metal Acetylacetonate ◽  
Work Up ◽  
Insight Into

The present paper aims to give insight into the art in the field of the synthesis, characterization and applications of Pd(0) nanoparticles immobilized onto silica/starch composite (SS-PdNPs) for hydrogenations and Suzuki coupling. Metal(0) nanoparticles immobilized onto silica/starch composite [SS-MNPs] were prepared from different metal acetylacetonate complexes [Co(acac)2], [Cu(acac)2], [Pd(acac)2],  [Ru(acac)3], [Mn(acac)3], [Co(acac)3] by immobilizing onto silica/starch composite, followed by reduction with NaBH4. Excellent yield of the products, reusability and the facile work-up makes SS-PdNPs a unique catalyst for the reduction of nitroarenes/carbonyl compounds, a,b unsaturated carbonyl compounds and Suzuki coupling under environmentally benign reaction conditions. All the catalysts were characterized by Fourier Transform Infra Red (FTIR), Atomic Absorption Spectroscopy (AAS) analyses,  while the most active catalyst [SS-PdNPs] was further characterized by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Copyright © 2019 BCREC Group. All rights reserved

Pyrolysis of metal–organic framework (CuBTC) decorated filter paper as a low-cost and highly active catalyst for the reduction of 4-nitrophenol

2018 ◽  
Vol 47 (43) ◽  
pp. 15458-15464 ◽  
Author(s):  
Lihua Zhi ◽  
Hua Liu ◽  
Youyuan Xu ◽  
Dongcheng Hu ◽  
Xiaoqiang Yao ◽  
...  
Keyword(s):  
High Stability ◽  
Active Catalyst ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Excellent Performance ◽  
Metal Free ◽  
Highly Active ◽  
Urgent Task ◽  
Metal Organic ◽  
Resource Shortage

The fabrication of noble metal free catalysts with excellent performance and high stability by a simple, efficient, general and low-cost approach remains an urgent task for solving the problem of resource shortage.

Chiral phenyl-bis(oxazoline) as an efficient auxiliary for asymmetric catalysis

2008 ◽  
Vol 80 (4) ◽  
pp. 743-749 ◽  
Author(s):  
Hisao Nishiyama ◽  
Jun-ichi Ito ◽  
Takushi Shiomi ◽  
Toru Hashimoto ◽  
Takeshi Miyakawa ◽  
...  
Keyword(s):  
Asymmetric Catalysis ◽  
Carbonyl Compounds ◽  
Catalytic Efficiency ◽  
Aldol Reactions ◽  
Rhodium Complexes ◽  
Cyclization Reactions ◽  
New Class ◽  
Conjugate Reduction ◽  
Aldehydes And Ketones ◽  
Reductive Aldol Reactions

A new class of phenyl-bis(oxazoline) auxiliaries was readily prepared from isophthaloyl chloride and appropriate β-amino alcohols, and the derived rhodium complexes underwent new cyclization reactions at the metal center and exhibited high catalytic efficiency for asymmetric conjugate reduction of α,β-unsaturated carbonyl compounds and reductive aldol reactions of aldehydes and ketones.

Recent Progress in Synthesizing Polyethers via Organocatalysts

Synlett ◽  
2021 ◽  
Author(s):  
Yao-Yao Zhang ◽  
Guan-Wen Yang ◽  
Guang-Peng Wu
Keyword(s):  
Molecular Weight ◽  
Recent Progress ◽  
Raw Materials ◽  
Catalytic Efficiency ◽  
Cost Effective ◽  
Catalytic Performance ◽  
Excellent Performance ◽  
Metallic Compounds ◽  
High Yields ◽  
Performance And Mechanism

Aliphatic polyethers are one of the most widely used polymers, whose synthesis is largely dependent on metallic compounds. Recent development of organocatalysts may break the limits of this long-standing field and infuse vitality into polyether production. In this Synpacts article, the recent advances of organocatalysts for polyether production is introduced in aspects of catalytic performance and mechanism. Moreover, attentions are paid to the latest contributions of bifunctional organoboron catalysts which can be prepared with high yields from cost-effective raw materials in two facile reactions and show excellent performance in the polyether production with remarkable catalytic efficiency, controllability on molecular weight, and explicit polymerization mechanism. Based on these advances, it is envisioned that new discoveries using organocatalysts will continue in the previsible future.

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