One-pot formic acid dehydrogenation and synthesis of benzene-fused heterocycles over reusable AgPd/WO2.72 nanocatalyst

Using nanoparticles (NPs) to catalyze multiple chemical reactions in one-pot and to achieve high-yield syntheses of functional molecules/materials is an important direction in NP chemistry, catalysis and applications. In this article, we report a nanocomposite of AgPd NPs anchored on WO2.72 nanorods...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2018, Vol.6 (46), p.23766-23772
Main Authors: Yu, Chao, Guo, Xuefeng, Shen, Bo, Zheng, Xi, Li, Qing, Yin, Zhouyang, Liu, Hu, Muzzio, Michelle, Shen, Mengqi, Li, Junrui, Seto, Christopher T, Sun, Shouheng
Format: Article
Language:English
Subjects:
Aldehydes
Benzene
Benzimidazoles
Catalysis
Chemical composition
Chemical reactions
Dehydrogenation
Formic acid
Heterocyclic compounds
Hydrocarbons
Nanocomposites
Nanoparticles
Nanorods
Nitrogen dioxide
Nitrophenol
Organic chemistry
Palladium
Ring structures
Silver
Tungsten oxides
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Summary:Using nanoparticles (NPs) to catalyze multiple chemical reactions in one-pot and to achieve high-yield syntheses of functional molecules/materials is an important direction in NP chemistry, catalysis and applications. In this article, we report a nanocomposite of AgPd NPs anchored on WO2.72 nanorods (NRs) (denoted as AgPd/WO2.72) as a general catalyst for formic acid dehydrogenation and transfer hydrogenation from Ar-NO2 to Ar-NH2 that further reacts with aldehydes to form benzene-fused heterocyclic compounds. The AgPd/WO2.72 catalysis is Ag/Pd dependent and Ag48Pd52 is the most active composition for the multiple chemical reactions. The high activity of AgPd/WO2.72 arises from strong interfacial interaction between AgPd and WO2.72, resulting in AgPd lattice expansion and electron polarization from AgPd to WO2.72. The syntheses proceed in one-pot reactions among formic acid, 2-nitrophenol (or 2-nitroaniline, or 2-nitrothiophenol) and aldehydes in dioxane/water (2/1 v/v) at 80–90 °C, leading to one-pot syntheses of benzoxazoles, benzimidazoles and benzothiazoles that are key ring structures present in functional compounds for pharmaceutical, optical and polymer applications.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta09342c