Catalytic activity of dithioic acid copper complexes in the alkyne–azide cycloaddition

2013 ◽  
Vol 91 (4) ◽  
pp. 292-299 ◽  
Author(s):  
Bayardo E. Velasco ◽  
Gustavo López-Téllez ◽  
Nelly González-Rivas ◽  
Iván García-Orozco ◽  
Erick Cuevas-Yañez
Keyword(s):  
Catalytic Activity ◽  
Copper Complex ◽  
Copper Complexes ◽  
Functional Group ◽  
High Efficiency ◽  
High Catalytic Activity ◽  
Different Temperatures ◽  
High Yields

Diverse dithioic acid copper complexes exhibit a high catalytic activity in the copper-catalyzed alkyne–azide cycloaddition using several solvents under different temperatures, showing a high efficiency with only 0.005 mmol catalyst/mmol alkyne or less. A dithioic acid copper complex derived from acetophenone was selected and used as the catalyst in the preparation of a library of 1,4-disubstituted-1,2,3-triazoles. This process occurred in high yields and good functional group tolerance.

TiO2–SiO2 nanocomposite as a highly efficient catalyst for the solvent-free cyclocondensation reaction of isatins, cyclohexanones, and urea

2019 ◽  
Vol 74 (7-8) ◽  
pp. 559-564
Author(s):  
Simin Janitabar-Darzi ◽  
Shahrzad Abdolmohammadi
Keyword(s):  
Present Method ◽  
High Efficiency ◽  
Solvent Free ◽  
High Catalytic Activity ◽  
One Pot ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Cyclocondensation Reaction ◽  
The One ◽  
High Yields

AbstractA TiO2–SiO2 nanocomposite catalyzes the one-pot cyclocondensation reaction of 1H-indole-2,3-diones (isatins), 1,3-cyclohexanediones, and urea at T = 70°C under solvent-free conditions with high efficiency. The present method affords the corresponding spiro products in high yields and short reaction time. The unique features of the TiO2–SiO2 nanocomposite are high catalytic activity, ease of preparation, non-toxicity, low loading, and recyclability.

Ruthenium- and Rhodium-Catalyzed Ring-Opening Coupling Reactions of Cyclopropenones with Alkenes or Alkynes

Synlett ◽  
2018 ◽  
Vol 29 (06) ◽  
pp. 717-722 ◽  
Author(s):  
Teruyuki Kondo ◽  
Ryosuke Taniguchi ◽  
Yu Kimura
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Methyl Acrylate ◽  
Ring Opening ◽  
Argon Atmosphere ◽  
High Catalytic Activity ◽  
Rhodium Complexes ◽  
Coupling Reactions ◽  
Internal Alkynes ◽  
High Yields

Ru3(CO)12-catalyzed divergent ring-opening coupling reactions of a cyclopropenone with methyl acrylate (an electron-deficient alkene) are developed. Under an argon atmosphere, a decarbonylative linear codimer is obtained, while cyclopentenones are obtained under carbon monoxide (20 atm) without decarbonylation. While ruthenium complexes show no catalytic activity for the ring-opening cocyclization of cyclopropenones with ethylene (20 atm) or bicyclo[2.2.1]hept-2-ene (2-norbornene), rhodium complexes, especially [RhCl(η4-1,5-cod)]2, show high catalytic activity for the desired cocyclization reactions to give the corresponding cyclopentenones in high yields and selectivities. In addition, [RhCl(η4-1,5-cod)]2 realizes the catalytic ring-opening co­cyclization of cyclopropenones with internal alkynes to give the corresponding cyclopentadienones. In all these reactions, ruthena- or rhodacyclobutenones are considered to be key intermediates, generated by strain-driven oxidative addition of a cyclopropenone C–C bond to an ­active ruthenium or rhodium species.

Selective isomerization of epoxides using magnetically recyclable ZSM-5 zeolite catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (96) ◽  
pp. 78441-78447 ◽  
Author(s):  
Phan Huy Hoang ◽  
Bach Nguyen Xuan
Keyword(s):  
Catalytic Activity ◽  
High Efficiency ◽  
Zeolite Catalyst ◽  
Isomerization Reaction ◽  
High Catalytic Activity ◽  
Long Lifetime

The magnetically recyclable ZSM-5 zeolite (MZZ) with high catalytic activity, high efficiency in separation, recycling and long lifetime for epoxide isomerization reaction was presented.

scholarly journals Preparation of porous TiO2 photocatalyts with different crystal phases and high catalytic activity by simple calcination of titanate nanofibers

RSC Advances ◽  
2017 ◽  
Vol 7 (72) ◽  
pp. 45742-45745 ◽  
Author(s):  
Yulan Peng ◽  
Xiaojun Shen ◽  
Lingzhi Wang ◽  
Baozhu Tian ◽  
Yongdi Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Large Surface Area ◽  
High Catalytic Activity ◽  
Porous Tio2 ◽  
Different Temperatures ◽  
Crystal Phases

Porous TiO2 materials with different crystal phases and large surface area were prepared by calcining titanate nanofibers under different temperatures for efficient photocatalysis.

scholarly journals Facile synthesis of biomass-based carbon materials nano-Ni-based catalysts and its application in selective hydrogenation of alkynes

2021 ◽  
Author(s):  
Jianguo liu ◽  
Jiangmin Sun ◽  
Longlong Ma
Keyword(s):  
Catalytic Activity ◽  
Selective Hydrogenation ◽  
Carbon Material ◽  
Large Scale ◽  
High Efficiency ◽  
Environmentally Friendly ◽  
Metal Catalyst ◽  
High Catalytic Activity ◽  
Chemical Research ◽  
Nickel Metal

The development of high efficiency, excellent selectivity, and super activity metal catalyst for chemical selective hydrogenation of alkynes to olefin is of great significance in the field of the chemical industry. At the same time, the development of a large number of available base metal catalysts for organic conversion remains an important objective of chemical research. Herein, we report a facile preparation of a simple, high catalytic activity, environmentally friendly, and inexpensive biomass carbon material supported nano-nickel catalyst from lignin residue. The entire preparation process of the catalyst is simple, reliable, economical, and environmentally friendly, which provides a potential utilization prospect for large-scale industrial applications of biomass-based carbon material catalysts. Biomass-based lignin residues can not only reduce the high oxidation state of nickel ions into nickel nanoparticles by the in-situ reducing gas generated during the calcination process, but the mesoporous structure of lignin residue also promotes the adsorption of nickel metal, which greatly improved the catalytic activity of biomass-based Ni-based catalysts. The simple synthetic green, cost-effective and sustainable biomass-based Ni-based catalyst shows good performance in the selective hydrogenation of phenylacetylene, reaching 97.2% conversion and 84.3% styrene selectivity, respectively.

scholarly journals Single-walled carbon nanotube supported Pt-Ru bimetallic superb nanocatalyst for the hydrogen generation from the methanolysis of methylamine-borane at mild conditions

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Eda Gokirmak Sogut ◽  
Hilal Acidereli ◽  
Esra Kuyuldar ◽  
Yasar Karatas ◽  
Mehmet Gulcan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Hydrogen Generation ◽  
Catalyst System ◽  
Metal Nanoparticle ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Different Temperatures

Abstract Several metal nanoparticle based catalysts have been synthesized for catalyzing the hydrogen production process by hydrolysis of methylamine-borane (MeAB). However, there was only one study that catalyzes the producing of hydrogenvia the methanolysis of MeAB, and it was carried out by our research group. For this reason, in this work, a new catalyst system entitled by single-walled carbon nanotube (SWCNT) supported bimetallic platinum-ruthenium nanoparticles were developed and called as PtRu@SWCNT. These NPs were characterized by several techniques (XRD, XPS, Raman, and TEM), and they were performed for the methanolysis of MeAB with high catalytic activity. The prepared PtRu@SWCNT NPs were also tested in the methanolysis of MeAB at different parameters including different temperatures, catalyst and substrate concentrations, and reusability performance. Experimental results revealed that the new PtRu@SWCNT NPs had excellent catalytic activity and reusability for removing of hydrogen from the methanolysis of MeAB at ambient conditions. According to the obtained data, the turnover frequency is 136.25 mole H2/mole PtRu × min, and the activation energy (Ea) is 17.29 kJ/mole. More than 99% of conversion was observed at room temperature.

One-step synthesis of wire-in-plate nanostructured materials made of CoFe-LDH nanoplates coupled with Co(OH)2 nanowires grown on a Ni foam for a high-efficiency oxygen evolution reaction

2019 ◽  
Vol 55 (29) ◽  
pp. 4218-4221 ◽  
Author(s):  
Lingxi Zhou ◽  
Meichen Guo ◽  
Yao Li ◽  
Qin Gu ◽  
Wenqian Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Evolution ◽  
Nanostructured Materials ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
High Catalytic Activity ◽  
Ni Foam ◽  
One Step

A series of wire-in-plate nanostructured electrocatalysts for OER with high catalytic activity were fabricated.

Catalytic performance of a Keplerate-type, giant-ball nanoporous isopolyoxomolybdate as a highly efficient recyclable catalyst for the synthesis of biscoumarins

2016 ◽  
Vol 71 (3) ◽  
pp. 219-225 ◽  
Author(s):  
Abolghasem Davoodnia ◽  
Ahmad Nakhaei ◽  
Niloofar Tavakoli-Hoseini
Keyword(s):  
Catalytic Activity ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Synthetic Approach ◽  
Organic Transformations ◽  
Aliphatic Aldehydes ◽  
Short Reaction Time ◽  
Type Giant ◽  
High Yields ◽  
Work Up

AbstractIn continuation of our previous works on the application of (NH4)42[MoVI72MoV60O372(CH3COO)30(H2O)72], a Keplerate-type giant-ball nanoporous isopolyoxomolybdate, as a catalyst for a series of organic transformations, in this paper, we discovered that this new attractive catalyst has high catalytic activity in the synthesis of biscoumarins prepared by the reaction of 4-hydroxycoumarin and aromatic or aliphatic aldehydes in refluxing ethanol. The catalyst was prepared according to a previously published literature procedure using inexpensive and readily available starting materials. Furthermore, the catalyst could be recovered conveniently and reused efficiently such that a considerable catalytic activity still could be achieved after fifth run. Other beneficial features of this new synthetic approach include short reaction time, high yields, clean reaction profiles, and a simple work-up procedure.

High Efficiency Nitrogen Doping and Single Atom Cobalt Anchoring via Supermolecules for Oxygen Reduction Electrocatalysis

2021 ◽  
Author(s):  
Libo Deng ◽  
Xiujuan Li ◽  
Yuanyuan Chen ◽  
Weijie Liao ◽  
Lei Qiu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Nitrogen Doping ◽  
High Efficiency ◽  
Carbon Support ◽  
Utilization Efficiency ◽  
Single Atom ◽  
High Catalytic Activity

Single atom catalysts (SACs) stabilized by nitrogen in a carbon support and having maximized atom utilization efficiency and an unsaturated environment exhibit high catalytic activity and selectivity. Incorporating nitrogen into...

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