Recent advancements in organic synthesis catalyzed by graphene oxide metal composites as heterogeneous nanocatalysts

2021 ◽  
Author(s):  
Jay Soni ◽  
Ayushi Sethiya ◽  
Nusrat Sahiba ◽  
Shikha Agarwal
Keyword(s):  
Graphene Oxide ◽  
Organic Synthesis ◽  
Metal Composites

scholarly journals Graphene Oxide as a Mediator in Organic Synthesis: a Mechanistic Focus

2020 ◽  
Vol 59 (47) ◽  
pp. 20767-20778
Author(s):  
Lorenzo Lombardi ◽  
Marco Bandini
Keyword(s):  
Graphene Oxide ◽  
Organic Synthesis

scholarly journals Regenerable Acidity of Graphene Oxide in Promoting Multicomponent Organic Synthesis

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Virgilio D. Ebajo ◽  
Cybele Riesse L. Santos ◽  
Glenn V. Alea ◽  
Yuya A. Lin ◽  
Chun-Hu Chen
Keyword(s):  
Graphene Oxide ◽  
Organic Synthesis ◽  
Lewis Acid ◽  
Photoelectron Spectroscopy ◽  
Acid Sites ◽  
Lewis Acidity ◽  
Epoxide Ring ◽  
Multicomponent Synthesis ◽  
Lewis Acid Sites ◽  
Toxic Reaction

Abstract The Brønsted acidity of graphene oxide (GO) materials has shown promising activity in organic synthesis. However, roles and functionality of Lewis acid sites remain elusive. Herein, we reported a carbocatalytic approach utilizing both Brønsted and Lewis acid sites in GOs as heterogeneous promoters in a series of multicomponent synthesis of triazoloquinazolinone compounds. The GOs possessing the highest degree of oxidation, also having the highest amounts of Lewis acid sites, enable optimal yields (up to 95%) under mild and non-toxic reaction conditions (85 °C in EtOH). The results of FT-IR spectroscopy, temperature-programed decomposition mass spectrometry, and X-ray photoelectron spectroscopy identified that the apparent Lewis acidity via basal plane epoxide ring opening, on top of the saturated Brønsted acidic carboxylic groups, is responsible for the enhanced carbocatalytic activities involving Knoevenagel condensation pathway. Recycled GO can be effectively regenerated to reach 97% activity of fresh GO, supporting the recognition of GO as pseudocatalyst in organic synthesis.

scholarly journals Graphene Oxide as a Mediator in Organic Synthesis: a Mechanistic Focus

2020 ◽  
Vol 132 (47) ◽  
pp. 20951-20962
Author(s):  
Lorenzo Lombardi ◽  
Marco Bandini
Keyword(s):  
Graphene Oxide ◽  
Organic Synthesis

Controllable synthesis of graphene oxide–silver (gold) nanocomposites and their size-dependencies

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 70468-70473 ◽  
Author(s):  
Xiaoqi Fu ◽  
Pengpeng Kuang ◽  
Shuang Wang ◽  
Guolin Zhang ◽  
Hengbo Yin
Keyword(s):  
Graphene Oxide ◽  
Raman Scattering ◽  
Metallic Nanoparticles ◽  
Controllable Synthesis ◽  
Metal Composites ◽  
Catalytic Activities ◽  
Size Dependent ◽  
Dependent Behavior ◽  
Gold Nanocomposites

The Raman scattering properties and catalytic activities of as-synthesized GO–metal composites were correlated with the size of metallic nanoparticles and exhibited size-dependent behavior.

Development of graphene oxide based catalyst for fine organic synthesis

TANSO ◽  
2018 ◽  
Vol 2018 (284) ◽  
pp. 170-172
Author(s):  
Naoki Morimoto
Keyword(s):  
Graphene Oxide ◽  
Organic Synthesis ◽  
Fine Organic Synthesis ◽  
Fine Organic

Bio-reduction of Graphene Oxide: Catalytic Applications of (Reduced) GO in Organic Synthesis

2020 ◽  
Vol 17 (3) ◽  
pp. 164-191
Author(s):  
Vijai K. Rai ◽  
Suhasini Mahata ◽  
Hemant Kashyap ◽  
Manorama Singh ◽  
Ankita Rai
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Organic Synthesis ◽  
Plant Extracts ◽  
Chemical Reduction ◽  
Relevant Literature ◽  
Advantages And Disadvantages ◽  
Reduced Graphene ◽  
Electrochemical Approach ◽  
Catalytic Applications

This work is based on various bio-reduction of graphene oxide into reduced graphene oxide and their applications in organic synthesis and group transformations. Graphene oxide, with abundant oxygencontaining functional groups on its basal plane, provides potential advantages, including excellent dispersibility in solvents and the good heterogeneous catalyst. This manuscript reviews various methods of synthesis of graphene and graphene oxide and a comparative study on their advantages and disadvantages, how to overcome disadvantages and covers extensive relevant literature review. In the last few years, investigation based on replacing the chemical reduction methods by some bio-compatible, chemical/impurity-free rGO including flash photo reductions, hydrothermal dehydration, solvothermal reduction, electrochemical approach, microwave-assisted reductions, light and radiation-induced reductions has been reported. Particularly, plant extracts have been applied significantly as an efficient reducing agent due to their huge bioavailability and low cost for bio-reduction of graphene oxide. These plant extracts mainly contain polyphenolic compounds, which readily get oxidized to the corresponding unreactive quinone form, which are the driving force for choosing them as bio-compatible catalyst. Currently, efforts are being made to develop biocompatible methods for the reduction of graphene oxide. The reduction abilities of such phytochemicals have been reported in the synthesis and stabilization of various nanoparticles viz. Ag, Au, Fe and Pd. Various part of plant extract has been applied for the green reduction of graphene oxide. Furthermore, the manuscript describes the catalytic applications of graphene oxide and reduced graphene oxide nanosheets as efficient carbo-catalysts for valuable organic transformations. Herein, important works dedicated to exploring graphene-based materials as carbocatalysts, including GO and rGO for organic synthesis including various functional group transformations, oxidation, reduction, coupling reaction and a wide number of multicomponent reactions have been highlighted. Finally, the aim of this study is to provide an outlook on future trends and perspectives for graphene-based materials in metal-free carbo-catalysis in green synthesis of various pharmaceutically important moieties.

Synthesis of copper oxide/reduced graphene oxide nanocomposite and its enhanced catalytic activity towards reduction of 4-nitrophenol

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 60763-60769 ◽  
Author(s):  
Chandrama Sarkar ◽  
Swapan K. Dolui
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Copper Oxide ◽  
Reduced Graphene Oxide ◽  
Organic Synthesis ◽  
Reduced Graphene ◽  
Catalytic Chemistry

Graphene oxide (GO) and its derivatives have attracted extensive interest in many fields, including catalytic chemistry, organic synthesis, and electrochemistry.

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