Hydrosilylation of carbonyls over electron-enriched Ni sites of intermetallic compound Ni3Ga heterogeneous catalyst

2021 ◽  
Author(s):  
Tomoaki Takayama ◽  
Rio Kariya ◽  
Yuki Nakaya ◽  
Shinya Furukawa ◽  
Seiji Yamazoe ◽  
...  
Keyword(s):  
Intermetallic Compound ◽  
Heterogeneous Catalyst ◽  
Room Temperature ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Aldehydes And Ketones

Nanoparticulate intermetallic compound Ni3Ga supported on SiO2 has emerged as a highly efficient catalyst for the hydrosilylation of carbonyls, such as aldehydes and ketones, at room temperature.

scholarly journals A New Heterogeneous Catalyst Obtained via Supramolecular Decoration of Graphene with a Pd2+ Azamacrocyclic Complex

Molecules ◽  
2019 ◽  
Vol 24 (15) ◽  
pp. 2714 ◽  
Author(s):  
Matteo Savastano ◽  
Paloma Arranz-Mascarós ◽  
Maria Paz Clares ◽  
Rafael Cuesta ◽  
Maria Luz Godino-Salido ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Self Assembly ◽  
Room Temperature ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Assembly Process ◽  
Efficient Catalyst ◽  
Mild Conditions ◽  
Cross Coupling Reaction ◽  
Green Procedure

A new G-(H2L)-Pd heterogeneous catalyst has been prepared via a self-assembly process consisting in the spontaneous adsorption, in water at room temperature, of a macrocyclic H2L ligand on graphene (G) (G + H2L = G-(H2L)), followed by decoration of the macrocycle with Pd2+ ions (G-(H2L) + Pd2+ = G-(H2L)-Pd) under the same mild conditions. This supramolecular approach is a sustainable (green) procedure that preserves the special characteristics of graphene and furnishes an efficient catalyst for the Cu-free Sonogashira cross coupling reaction between iodobenzene and phenylacetylene. Indeed, G-(H2L)-Pd shows an excellent conversion (90%) of reactants into diphenylacetylene under mild conditions (50 °C, water, aerobic atmosphere, 14 h). The catalyst proved to be reusable for at least four cycles, although decreasing yields down to 50% were observed.

Graphene oxide–TiO2 composite: an efficient heterogeneous catalyst for the green synthesis of pyrazoles and pyridines

2016 ◽  
Vol 40 (6) ◽  
pp. 5053-5060 ◽  
Author(s):  
Shweta Kumari ◽  
Amiya Shekhar ◽  
Devendra D. Pathak
Keyword(s):  
Graphene Oxide ◽  
Green Synthesis ◽  
Aqueous Medium ◽  
Heterogeneous Catalyst ◽  
Room Temperature ◽  
Highly Efficient ◽  
Recyclable Heterogeneous Catalyst ◽  
Efficient Heterogeneous Catalyst

GO–TiO2 has been found to be a highly efficient and recyclable heterogeneous catalyst for the synthesis of pyrazoles and pyridines in aqueous medium at room temperature.

SiO2·12WO3·24H2O: a Highly Efficient Catalyst for the Synthesis of 5-Arylidene Barbituric Acid in the Presence of Water

2009 ◽  
Vol 62 (4) ◽  
pp. 353 ◽  
Author(s):  
Ji-Tai Li ◽  
Ming-Xuan Sun
Keyword(s):  
Room Temperature ◽  
Barbituric Acid ◽  
Aqueous Media ◽  
Aromatic Aldehydes ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Efficient Route ◽  
Acid Catalyzed ◽  
High Yields

The condensation of aromatic aldehydes and barbituric acid catalyzed by SiO2·12WO3·24H2O in aqueous media at room temperature gave 5-arylidene barbituric acid in high yields with or without the use of ultrasound, providing a simple and efficient route to synthesis of these compounds.

Retracted Article: Monodisperse Ni3Fe single-crystalline nanospheres as a highly efficient catalyst for the complete conversion of hydrous hydrazine to hydrogen at room temperature

2013 ◽  
Vol 1 (21) ◽  
pp. 6425-6432 ◽  
Author(s):  
Dong Ge Tong ◽  
Dong Mei Tang ◽  
Wei Chu ◽  
Gui Fang Gu ◽  
Ping Wu
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Complete Conversion ◽  
Efficient Catalyst ◽  
Single Crystalline ◽  
Highly Efficient ◽  
Retracted Article

Monodisperse Ni3Fe single-crystalline nanospheres exhibited highly catalytic activity for the complete conversion of hydrous hydrazine to hydrogen at room temperature.

scholarly journals Fe(II)-phthalocyanine supported on chitosan aerogel as a catalyst for oxidation of alcohols and alkyl arenes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fatemeh Azimi ◽  
Ahmad Poursattar Marjani ◽  
Sajjad Keshipour
Keyword(s):  
Aspect Ratio ◽  
Heterogeneous Catalyst ◽  
High Aspect Ratio ◽  
Room Temperature ◽  
Oxidation Reactions ◽  
Mild Conditions ◽  
Oxidation Of Alcohols ◽  
Aromatic Alcohols ◽  
Aldehydes And Ketones ◽  
Low Toxicity

AbstractManipulation of materials is considered as one of the eminent strategies to create desirable catalysts. In this regard, increasing surface area and decreasing dimensions of catalysts have been widely employed on account of effectiveness of these methods. Herein, aerogel form of chitosan as a sustainable, and high aspect ratio compound is employed as a green support for the catalytic purposes. Chitosan aerogel was modified with Fe(II)-phthalocyanine to produce a heterogeneous catalyst for oxidation reactions. The synthesized catalyst promoted the oxidation reactions of alcohols and alkyl arenes to the corresponding aldehydes and ketones using H2O2 as an oxidant in 24 h. The reactions for aliphatic and aromatic alcohols gave turnover numbers of 106–109 at 80 °C and 106–117 at room temperature, respectively. The oxidations of alkyl arenes were carried out with turnover numbers laying in the range of 106–117 at 100 °C. The low toxicity, inexpensive nature, and recycling possibility of the catalyst accompanied by the reaction mild conditions, clean oxidant, and excellent yields offer chitosan aerogel modified with Fe(II)-phthalocyanine as a promising catalyst for oxidation reactions.

scholarly journals Textile-supported silver nanoparticles as a highly efficient and recyclable heterogeneous catalyst for nitroaromatic reduction at room temperature

RSC Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 6288-6292 ◽  
Author(s):  
Wei Feng ◽  
Tingting Huang ◽  
Liqian Gao ◽  
Xianfeng Yang ◽  
Wenbin Deng ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Heterogeneous Catalyst ◽  
Room Temperature ◽  
Highly Efficient ◽  
Excellent Activity ◽  
Recyclable Heterogeneous Catalyst

A novel textile-supported nanosilver (TsNS) catalyst was prepared and applied in nitroaromatic reduction with excellent activity, stability and recyclability.

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