Metallfreie Bor‐haltige Heterogenkatalysatoren

Fang, Yuanxing; Wang, Xinchen

doi:10.1002/ange.201707824

Angewandte Chemie

2017

DOI: 10.1002/ange.201707824

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Metallfreie Bor‐haltige Heterogenkatalysatoren

Yuanxing Fang

Xinchen Wang

Abstract: Metallfreie Katalysatoren haben spezifische Vorteile gegenüber Metall‐ und Metalloxidkatalysatoren, z. B. sind sie kostengünstiger, zuverlässiger und nachhaltiger. Unter den Nichtmetallverbindungen für die Katalyse wurden Bor‐haltige Verbindungen mit einigen einzigartigen Eigenschaften entwickelt. In diesem Kurzaufsatz werden die aktuellen Entwicklungen auf dem Gebiet Bor‐haltiger, metallfreier Katalysatoren vorgestellt, darunter binäre und ternäre Bor‐haltige Katalysatormaterialien. Außerdem werden die drei H… Show more

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Cited by 19 publications

References 88 publications

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Metal‐ and Additive‐Free Aerobic Dehydrogenation of N‐Heterocycles and Hydrocarbons by N‐Doped Carbon

Shang

et al. 2022

Asian J Org Chem

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Over metal catalysts, N-heteroarenes, as one of the most versatile building blocks in pharmaceuticals, bioactive molecules and natural products, can be easily accessed by the oxidation of N-heterocycles. Herein, we describe N-doped hierarchical pore carbons (N-HPCs) derived from readily available biomass (flour) efficiently catalyzed aerobic dehydrogenation of N-heterocycles without any additives under mild conditions, owing to N dopant and high surface area indicated by characterization analysis. A wide range of Nheteroarenes including quinolines, quinolinol, dihydroisoqui-nolines, isoquinolines, indoles, quinoxaline and acridine were obtained in good to excellent yields (36 examples, up to 99% yield). Mechanistic studies revealed a strikingly different nonfree radical process from metal catalysts, for which an apparent activation energy of 66.4 kJ mol À 1 was found. Moreover, the N-doped carbon exhibited robust stability and yielded 74.5% quinoline at the sixth reaction. The use of metal-free catalysts in organic synthesis is attractive but practically challenging. This work provides a promising example for metal-free catalysis.

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Metal‐ and Additive‐Free Aerobic Dehydrogenation of N‐Heterocycles and Hydrocarbons by N‐Doped Carbon

Shang

et al. 2022

Asian J Org Chem

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Photocatalytic Oxygen Evolution from Functional Triazine‐Based Polymers with Tunable Band Structures

et al. 2017

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Conjugated polymers (CPs) are emerging and appealing light harvesters for photocatalytic water splitting owingt ot heir adjustable band gap and facile processing. Herein, we report an advanced mild synthesis of three conjugated triazine-based polymers (CTPs) with different chain lengths by increasing the quantity of electron-donating benzyl units in the backbone.V arying the chain length of the CTPs modulates their electronic,optical, and redoxproperties, resulting in an enhanced performance for photocatalytic oxygen evolution, whichi st he more challenging half-reaction of water splitting owing to the sluggish reaction kinetics.O ur results could stimulate interest in these functional polymers where amolecular engineering strategy enables the production of suitable semiconductor redox energetics for oxygenic photosynthesis.

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Metal‐Free Dehydrogenation of N‐Heterocycles by Ternary h‐BCN Nanosheets with Visible Light

et al. 2018

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An efficient metal‐free catalytic system has been developed based on hexagonal boron carbon nitride (h‐BCN) nanosheets for the dehydrogenation of N‐heterocycles with visible light; hydrogen gas is released in the process, and thus no proton acceptor is needed. This acceptorless dehydrogenation of hydroquinolines, hydroisoquinolines, and indolines to the corresponding aromatic N‐heterocycles occurred in excellent yield under visible‐light irradiation at ambient temperature. With h‐BCN as the photocatalyst and water as the solvent, this environmentally benign protocol shows broad substitution tolerance and high efficiency.

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Metallfreie Bor‐haltige Heterogenkatalysatoren

Cited by 19 publications

References 88 publications

Metal‐ and Additive‐Free Aerobic Dehydrogenation of N‐Heterocycles and Hydrocarbons by N‐Doped Carbon

Metal‐ and Additive‐Free Aerobic Dehydrogenation of N‐Heterocycles and Hydrocarbons by N‐Doped Carbon

Photocatalytic Oxygen Evolution from Functional Triazine‐Based Polymers with Tunable Band Structures

Metal‐Free Dehydrogenation of N‐Heterocycles by Ternary h‐BCN Nanosheets with Visible Light

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