Synthesis of a sustainable heterogeneous catalyst, titanium dioxide‐loaded hydroxyapatite for functionalised chromen‐dihydropyridines under green conditions

2021 ◽  
Author(s):  
Challa Madhavi ◽  
Himavathi Ganja ◽  
Nagaraju Kerru ◽  
Suresh Maddila ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Titanium Dioxide ◽  
Heterogeneous Catalyst ◽  
Green Conditions

Synthesis of carbonate esters by carboxymethylation using NaAlO2 as a highly active heterogeneous catalyst

2018 ◽  
Author(s):  
Sreerangappa Ramesh ◽  
Kiran Indukuri ◽  
Olivier Riant ◽  
Damien Debecker
Keyword(s):  
Heterogeneous Catalyst ◽  
Dimethyl Carbonate ◽  
Sodium Aluminate ◽  
High Yield ◽  
Solid Catalyst ◽  
Highly Active ◽  
Aromatic Alcohols ◽  
Green Conditions ◽  
Mixed Carbonate

<p>Sodium aluminate is presented as a highly active heterogeneous catalyst able to convert a range of alcohols into the corresponding mixed carbonate esters, in high yield and under green conditions. The reaction is carried out using dimethyl carbonate both as a reactant and solvent, at 90°C. Allylic, aliphatic and aromatic alcohols are converted in good yields. The solid catalyst is shown to be truly heterogeneous, resistant to leaching, and recyclable. </p>

scholarly journals Catalytic Synthesis of 3-Methyl-1-phenyl-1H-benzo[g]pyrazolo[3,4-b]quinoline-5,10-dione Derivatives Using Cerium Oxide Nanoparticles as Heterogeneous Catalyst in Green Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Ali Gharib ◽  
Bibi Robabeh Hashemipour Khorasani ◽  
Manouchehr Jahangir ◽  
Mina Roshani ◽  
Reza Safaee
Keyword(s):  
Heterogeneous Catalyst ◽  
Cerium Oxide ◽  
Simple Procedure ◽  
Catalytic Synthesis ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Green Solvent ◽  
One Pot ◽  
Short Reaction Time ◽  
Green Conditions

We have developed a new methodology for the synthesis of 3-methyl-1-phenyl-1H-benzo[g]pyrazolo[3,4-b]quinoline-5,10-dione derivatives in excellent yields. A new green chemistry protocol with the reusability of the nanoparticle as catalyst has been developed for the synthesis of 3-methyl-1-phenyl-1H-benzo[g]pyrazolo[3,4-b]quinoline-5,10-dione derivatives via one-pot reaction of 3-methyl-1-phenyl-1H-pyrazol-5-amine, arylaldehydes, and 2-hydroxynaphthalene-1,4-dione in water as green solvent and using cerium oxide nanoparticles (CONPs) as heterogeneous catalyst. The present methodology affords several advantages such as simple procedure, excellent yields, and short reaction time. The catalyst is inexpensive, stable, easily recycled, and reused for several cycles with consistent activity.

scholarly journals Silver Nanoparticles Supported on Chitosan as a Green and Robust Heterogeneous Catalyst for Direct Synthesis of Nitrogen Heterocyclic Compounds under Green Conditions

2019 ◽  
Vol 14 (1) ◽  
pp. 51 ◽  
Author(s):  
Seyedeh Fazileh Fazileh Hamzavi ◽  
Shahla Jamili ◽  
Morteza Yousefzadi ◽  
Ali Mashinchian Moradi ◽  
Narges Amrollahi Biuki
Keyword(s):  
Silver Nanoparticles ◽  
Heterogeneous Catalyst ◽  
Heterocyclic Compounds ◽  
Direct Synthesis ◽  
Biologically Active ◽  
Imidazole Derivatives ◽  
Solvent Free Conditions ◽  
Three Component Reaction ◽  
Green Conditions ◽  
Nitrogen Heterocyclic

The catalytic efficiency of silver nanoparticles supported on chitosan as a green, robust, and efficient nanocatalyst for the direct synthesis of biologically active compounds, such as: imidazole derivatives as well as pyrazine scaffolds through multi-component reactions strategy, have been demonstrated. In this work, imidazole derivatives were achieved via pseudo four-component reactions by utilization of benzaldehydes, benzils, anilines, and ammonium acetate under solvent-free conditions. Moreover, pyrazine scaffolds were synthesized through a three-component reaction of phenylenediamine derivatives, isocyanides and various ketones in water. The main advantages of this protocol are the  reusability of the catalyst, operational simplicity, mild reaction conditions, and high-yielding. Copyright © 2019 BCREC Group. All rights reservedReceived: 19th January 2018; Revised: 10th September 2018; Accepted: 18th September 2018; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Hamzavi, S.F., Jamili, S., Yousefzadi, M., Moradi, A.M., Biuki, N.A. (2019). Silver Nanoparticles Supported on Chitosan as a Green and Robust Heterogeneous Catalyst for Direct Synthesis of Nitrogen Heterocyclic Compounds under Green Conditions. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 51-59 (doi:10.9767/bcrec.14.1.2105.51-59)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.2105.51-59 

scholarly journals Titanium Dioxide as a Catalyst in Biodiesel Production

Catalysts ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 75 ◽  
Author(s):  
Claudia Carlucci ◽  
Leonardo Degennaro ◽  
Renzo Luisi
Keyword(s):  
Titanium Dioxide ◽  
Heterogeneous Catalyst ◽  
Alternative Fuels ◽  
Methyl Esters ◽  
High Surface ◽  
Production Costs ◽  
Biodiesel Production ◽  
Chemical Transformations ◽  
Base Property ◽  
Metal Support Interaction

The discovery of alternative fuels that can replace conventional fuels has become the goal of many scientific researches. Biodiesel is produced from vegetable oils through a transesterification reaction that converts triglycerides into fatty acid methyl esters (FAME), with the use of a low molecular weight alcohol, in different reaction conditions and with different types of catalysts. Titanium dioxide has shown a high potential as heterogeneous catalyst due to high surface area, strong metal support interaction, chemical stability, and acid–base property. This review focused on TiO2 as heterogeneous catalyst and its potential applications in the continuous flow production of biodiesel. Furthermore, the use of micro reactors, able to make possible chemical transformations not feasible with traditional techniques, will enable a reduction of production costs and a greater environmental protection.

scholarly journals Nickel phosphide nanoalloy catalyst for the selective deoxygenation of sulfoxides to sulfides under ambient H2 pressure

2020 ◽  
Vol 18 (43) ◽  
pp. 8827-8833
Author(s):  
Shu Fujita ◽  
Sho Yamaguchi ◽  
Seiji Yamazoe ◽  
Jun Yamasaki ◽  
Tomoo Mizugaki ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Heterogeneous Catalyst ◽  
Precious Metal ◽  
Nickel Phosphide ◽  
Highly Active ◽  
Selective Deoxygenation

A titanium-dioxide-supported nickel phosphide nanoalloy (nano-Ni2P/TiO2) functions as a highly active non-precious-metal-based heterogeneous catalyst for the selective deoxygenation of sulfoxides to sulfides under just 1 bar of H2.

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