scholarly journals Photoinitiated Multicomponent Anti-Markovnikov Alkoxylation over Graphene Oxide

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 475
Author(s):  
Liang Nie ◽  
Xiangjun Peng ◽  
Haiping He ◽  
Jian Hu ◽  
Zhiyang Yao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Visible Light ◽  
Environmentally Friendly ◽  
Organic Transformations ◽  
Catalytic Systems ◽  
Alkoxyl Radical ◽  
Radical Intermediates ◽  
Benzyl Radicals ◽  
Markovnikov Addition

The development of graphene oxide–based heterogeneous materials with an economical and environmentally–friendly manner has the potential to facilitate many important organic transformations but proves to have few relevant reported reactions. Herein, we explore the synergistic role of catalytic systems driven by graphene oxide and visible light that form nucleophilic alkoxyl radical intermediates, which enable an anti-Markovnikov addition exclusively to the terminal alkenes, and then the produced benzyl radicals are subsequently added with N–methylquinoxalones. This photoinduced cascade radical difunctionalization of olefins offers a concise and applicable protocol for constructing alkoxyl–substituted N–methylquinoxalones.

Reduced graphene oxide coupled CdS/CoFe2O4 ternary nanohybrid with enhanced photocatalytic activity and stability: a potential role of reduced graphene oxide as a visible light responsive photosensitizer

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 96562-96572 ◽  
Author(s):  
Simrjit Singh ◽  
Neeraj Khare
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Potential Role ◽  
Core Shell ◽  
Reduced Graphene

We report the coupling of a CdS/CoFe2O4 core/shell nanorod heterostructure onto 2D platform of reduced graphene oxide (RGO) sheets in which a role of RGO as a visible light responsive photosensitizer is shown for enhanced photocatalytic activity.

scholarly journals Green synthesis of PbCrO4 nanostructures using gum of ferula assa-foetida for enhancement of visible-light photocatalytic activity

RSC Advances ◽  
2018 ◽  
Vol 8 (71) ◽  
pp. 40934-40940 ◽  
Author(s):  
Rahele Zhiani ◽  
Ali Es-haghi ◽  
Seyed Mohsen Sadeghzadeh ◽  
Farzaneh Shamsa
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Green Synthesis ◽  
Selective Oxidation ◽  
Environmentally Friendly ◽  
Organic Transformations ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Photocatalytic selective oxidation has attracted considerable attention as an environmentally friendly strategy for organic transformations.

scholarly journals Interface-Controlled Pd Nanodot-Au Nanoparticle Colloids for Efficient Visible-Light-Induced Photocatalytic Suzuki-Miyaura Coupling Reaction

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 463 ◽  
Author(s):  
Eunmi Kang ◽  
Hyeon Shin ◽  
Dong-Kwon Lim
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Visible Light ◽  
Coupling Reaction ◽  
Interface Layer ◽  
Au Nanoparticle ◽  
Light Illumination ◽  
Graphene Interface

Plasmonic nanostructures can be employed for performing photocatalytic reactions with visible-light illumination involving two different possible mechanisms, namely, the near-field enhancement and/or direct hot-electron transfer to the conduction band of an active catalyst. In this study, we demonstrate the significant contribution of a graphene interface layer present between plasmonic nanoparticles and active catalysts (Pd nanodots) in enhancing the photocatalytic efficiency of Pd nanodots through an accelerated electron transfer process. The well-defined Pd-nanodot-modified gold nanoparticles with or without a graphene interface layer were prepared using a wet-chemical synthetic method. The role of the graphene interface was investigated by performing wavelength-dependent reduction studies using potassium hexacyanoferrate (III) in the presence of Pd-nanodot-modified cysteamine-modified AuNPs (Pd-cys-AuNPs), Pd-nanodot-modified graphene oxide (GO)-coated AuNPs (Pd-GO-AuNPs), and Pd-nanodot-modified reduced GO (rGO)-coated AuNPs (Pd-rGO-AuNPs). The fastest rate for the reduction of Fe3+ to Fe2+ was obtained with Pd-rGO-AuNPs because of the fast electron transfer achieved in the presence of the reduced graphene oxide layer. The highest catalytic activity for the visible-light induced C-C coupling reaction was obtained with Pd-rGO-AuNPs, indicating the role of the graphene interface layer. These results indicate that the design and use of engineered interfaces are of importance to achieve enhanced catalytic activity with plasmonic hybrid nanomaterials.

Green organic transformations: novelty of graphene oxide (GO) and sulfonated graphene oxide (SGO)

2020 ◽  
Vol 07 ◽  
Author(s):  
Puja Basak ◽  
Pranab Ghosh
Keyword(s):  
Graphene Oxide ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
High Thermal Stability ◽  
Homogeneous Catalyst ◽  
Organic Transformations ◽  
Sulfonated Graphene ◽  
Catalytic Role

: Now-a-days, the use of carbocatalyst has attracted much attention due to their sustainability and affordability. Graphene oxide (GO) and sulfonated graphne oxide (SGO) have been emerged as an environmental friendly, metal free, inexpensive carbocatalyst for the synthesis of organic compounds. Herein, the profound role of GO and SGO in different organic transformation has been established. The GO and SGO being heterogeneous in nature, have high thermal stability over homogeneous catalyst in successive runs and can easily be recovered. The presence of oxygen containing acidic groups in GO and SGO mainly catalyzes the organic reactions. This mini review is emphasized on the catalytic role of GO and SGO as green and reusable solid acid catalyst in different organic synthesis.

The Role of Graphene Oxide in Ag3PO4/graphene Oxide Composites for Enhanced Visible-light-driven Photocatalytic Ability

2016 ◽  
Vol 19 (2) ◽  
Author(s):  
Weiqiang Zhang ◽  
Xiufang Zhang ◽  
Xueming Dang ◽  
Xiaoli Dong ◽  
Hongchao Ma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Visible Light ◽  
Ultrasonic Irradiation ◽  
Chemical Oxidation ◽  
Photocatalytic Ability ◽  
Visible Light Driven ◽  
Oxide Composites

AbstractThe graphene oxide (GO) is fabricated by chemical oxidation or chemical oxidation combined with ultrasonic irradiation (COUI) from graphite. Ag

scholarly journals Ceramic boron carbonitrides for unlocking organic halides with visible light

2021 ◽  
Author(s):  
Tao Yuan ◽  
Meifang Zheng ◽  
Markus Antonietti ◽  
Xinchen Wang
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Transfer Process ◽  
Organic Transformations ◽  
Electron Transfer Process ◽  
Radical Intermediates ◽  
Organic Halides

Photochemistry provides a sustainable pathway for organic transformations by inducing radical intermediates from substrates through electron transfer process. Albeit, the progress is limited by heterogeneous photocatalysts that are required to...

Catalytic Activity of Binary and Triple Systems Based on Redox Inactive Metal Compound, LiSt and Additives of Monodentate Ligands-Modifiers: DMF, HMPA and PhOH, in Selective Ethylbenzene Oxidation with Dioxygen

2016 ◽  
Vol 10 (3) ◽  
pp. 259-270
Author(s):  
Ludmila Matienko ◽  
◽  
Larisa Mosolova ◽  
Vladimir Binyukov ◽  
Gennady Zaikov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Triple System ◽  
Metal Compound ◽  
Ethylbenzene Oxidation ◽  
Catalytic Systems ◽  
Triple Systems ◽  
Lithium Compound ◽  
Mechanism Of Catalysis ◽  
Monodentate Ligands

Mechanism of catalysis with binary and triple catalytic systems based on redox inactive metal (lithium) compound {LiSt+L2} and {LiSt+L2+PhOH} (L2=DMF or HMPA), in the selective ethylbenzene oxidation by dioxygen into -phenylethyl hydroperoxide is researched. The results are compared with catalysis by nickel-lithium triple system {NiII(acac)2+LiSt+PhOH} in selective ethylbenzene oxidation to PEH. The role of H-bonding in mechanism of catalysis is discussed. The possibility of the stable supramolecular nanostructures formation on the basis of triple systems, {LiSt+L2+PhOH}, due to intermolecular H-bonds, is researched with the AFM method.

Dual-Function, Light Switchable Cobalt Catalysis via Active Site Metamorphosis

2019 ◽  
Author(s):  
Enrico Bergamaschi ◽  
Frédéric Beltran ◽  
Christopher Teskey
Keyword(s):  
Visible Light ◽  
Active Site ◽  
Catalytic Site ◽  
Dual Function ◽  
Catalytic Systems ◽  
Hydride Complex ◽  
Dual Functional ◽  
Multiple Processes ◽  
Olefin Migration

<p></p><p></p><p>Switchable catalysis offers opportunities to control the rate or selectivity of a reaction <i>via</i> a stimulus such as pH or light. However, few examples of switchable catalytic systems that can facilitate multiple processes exist. Here we report a rare example of such dual-functional, switchable catalysis. Featuring an easily prepared, bench-stable cobalt(I) hydride complex in conjunction with pinacolborane, we can completely alter the reaction outcome between two widely employed transformations – olefin migration and hydroboration – with visible light as the sole trigger. This dichotomy arises from ligand photodissociation which leads to metamorphosis of the active catalytic site, resulting in divergent mechanistic pathways.</p><p></p><p></p>

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