Carbokatalyse in Flüssigphasenreaktionen

Wen, Guangwu; Wu, Shuchang; Peng, Feng; Schlögl, Robert

doi:10.1002/ange.201600906

Cited by 37 publications

(1 citation statement)

References 359 publications

(245 reference statements)

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“…In the drive toward green and sustainable chemistry, carbon materials have been extensively explored as a cheap and alternative catalysts on a large scale . The catalytic application of graphene and derivations (e. g., graphene oxide (GO), reduced graphene oxide (RGO)) has only recently emerged, and it has attracted substantial research interests as new exciting catalysts.…”

Section: Introductionmentioning

confidence: 99%

Selective Etching of N‐Doped Graphene Meshes as Metal‐Free Catalyst with Tunable Kinetics, High Activity and the Origin of New Catalytic Behaviors

Dai

Zhou

Huang

et al. 2018

Part & Part Syst Charact

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New N‐doped reduced graphene oxide (N‐RGO) meshes are facile fabricated by selective etching of 3–5 nm nanopores, with controllable doping of N dopants at an ultrahigh N/C ratio up to 15.6 at%, from pristine graphene oxide sheets in one‐pot hydrothermal reaction. The N‐RGO meshes are illustrated to be an efficient metal‐free catalyst toward hydrogenation of 4‐nitrophenol, with new catalytic behaviors emerging in following three aspects: (i) tunable kinetics following pseudofirst order from commonly observed pseudozero order; (ii) strikingly improved activity with 26‐fold increased rate constant (1.0 s−1 g−1 L); (iii) no induction time required prior to reaction due to depressed back conversion, and dramatically decreased apparent activation energy (Ea) (17 kJ mol−1). The origin of these new catalytic properties can be assigned to the synergetic effects between graphitic N doping and structural defects arising from nanopores. Deeper understanding unveils that the concentration of graphitic N is inverse proportion to Ea, while the pyrrolic N has no impact on this reaction, and oxygenate groups hampers it. The porous nature allows the N‐RGO meshes to conduct catalyze reactions in continuous flow fashion.

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Section: Introductionmentioning

confidence: 99%

Selective Etching of N‐Doped Graphene Meshes as Metal‐Free Catalyst with Tunable Kinetics, High Activity and the Origin of New Catalytic Behaviors

Dai

Zhou

Huang

et al. 2018

Part & Part Syst Charact

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Dehydrogenation of Nitrogen Heterocycles Using Graphene Oxide as a Versatile Metal‐Free Catalyst under Air

Zhang

Chen

et al. 2017

Adv Synth Catal

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Graphene oxide (GO) has been developed as an inexpensive,e nvironmental friendly, metal-free carbocatalyst for the dehydrogenation of nitrogen heterocycles.V aluable compounds,s uch as quinoline, 3,4-dihydroisoquinoline,q uinazoline,a nd indole derivatives,h aveb een successfully used as substrates.T he investigation of various oxygen-containing molecules with different conjugateds ystems indicated that botht he oxygen-containing groups and large p-conjugated system in GO sheets are essential for this reaction.

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Graphene‐Oxide‐Catalyzed Cross‐Dehydrogenative Coupling of Oxindoles with Arenes and Thiophenols

Qiu

Zhang

et al. 2019

Adv Synth Catal

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Here, we explore the GO‐catalyzed cross‐dehydrogenative coupling of oxindoles with arenes and thiophenols for the rapid synthesis of 3‐aryloxindoles and 3‐sulfenylated oxindoles. Control experiments and small‐molecule mimicking studies reveal that the acidic nature and quinone‐type functionalities of GO are synergistically utilized for the coupling reaction. The reaction proceeds under simple and mild reaction conditions, exhibits good functional group tolerance, and can be easily scaled up to the gram level.

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Carbokatalyse in Flüssigphasenreaktionen

Cited by 37 publications

References 359 publications

Selective Etching of N‐Doped Graphene Meshes as Metal‐Free Catalyst with Tunable Kinetics, High Activity and the Origin of New Catalytic Behaviors

Selective Etching of N‐Doped Graphene Meshes as Metal‐Free Catalyst with Tunable Kinetics, High Activity and the Origin of New Catalytic Behaviors

Dehydrogenation of Nitrogen Heterocycles Using Graphene Oxide as a Versatile Metal‐Free Catalyst under Air

Graphene‐Oxide‐Catalyzed Cross‐Dehydrogenative Coupling of Oxindoles with Arenes and Thiophenols

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