2-Pyridyl-benzimidazole-Pd(II)/Pd(0) Supported on Magnetic Mesoporous Silica: Aerobic Oxidation of Benzyl Alcohols/Benzaldehydes and Reduction of Nitroarenes

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Surveys from Asia Pub Date : 2022-05-10 DOI:10.1007/s10563-022-09360-0

Mohammad Sajedi, Yagoub Mansoori, Ayat Nuri, Somayeh Fekri, Dolores Esquivel, Mª Angeles Navarro

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引用次数: 4

Abstract

2-(2-Pyridyl)benzimidazole (PyBzIm) was supported onto magnetic mesoporous silica, Fe₃O₄@SiO₂@SBA-15 via the click chemistry. The supported ligand was treated with Na₂PdCl₄ in methanol to afford Fe₃O₄@SiO₂@SBA-PyBzIm-Pd(II) as a magnetically retrievable supported catalyst. The catalyst was fully characterized by conventional methods. X-ray photoelectron spectroscopy (XPS) studies confirmed some C = N nitrogen atoms interact with palladium in the + 2 oxidation state. The prepared catalyst was found to catalyze the aerobic oxidation of benzyl alcohols and benzaldehydes to the corresponding benzoic acids, and excellent conversions were obtained. The magnetic catalyst showed a very low metal leaching (3.9%) in the first run. Fe₃O₄@SiO₂@SBA-PyBzIm-Pd(II) was then treated with aqueous NaBH₄ to give Fe₃O₄@SBA-PyBzIm-Pd(0). The obtained catalyst was found to catalyze the transfer hydrogenation of nitroarenes to the corresponding anilines in the presence of hydrazine, and excellent yields were obtained. The prepared catalysts present an excellent recycling efficiency over seven consecutive runs without significant loss of catalyst reactivity.

Graphical abstract

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磁性介孔二氧化硅负载的2-吡啶-苯并咪唑-Pd(II)/Pd(0):苯甲醇/苯甲醛的好氧氧化和硝基芳烃的还原

通过点击化学将2-(2-吡啶基)苯并咪唑(PyBzIm)负载在磁性介孔二氧化硅Fe3O4@SiO2@SBA-15上。负载配体用Na2PdCl4在甲醇中处理，得到Fe3O4@SiO2@ sba - pybzem - pd (II)作为磁性可回收负载催化剂。用常规方法对催化剂进行了表征。x射线光电子能谱(XPS)研究证实了一些C = N的氮原子与钯以+ 2氧化态相互作用。所制备的催化剂能催化苯甲醇和苯甲醛的好氧氧化生成苯甲酸，并取得了良好的转化率。在第一次运行中，磁性催化剂的金属浸出率很低(3.9%)。Fe3O4@SiO2@SBA-PyBzIm-Pd(II)用NaBH4水溶液处理得到Fe3O4@SBA-PyBzIm-Pd(0)。结果表明，该催化剂能在肼存在下催化硝基芳烃的转移加氢反应生成相应的苯胺，收率较高。制备的催化剂在连续七次运行中表现出优异的回收效率，而催化剂的反应性没有明显损失。图形抽象

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来源期刊

Catalysis Surveys from Asia 化学-物理化学

CiteScore

4.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Early dissemination of important findings from Asia which may lead to new concepts in catalyst design is the main aim of this journal. Rapid, invited, short reviews and perspectives from academia and industry will constitute the major part of Catalysis Surveys from Asia . Surveys of recent progress and activities in catalytic science and technology and related areas in Asia will be covered regularly as well. We would appreciate critical comments from colleagues throughout the world about articles in Catalysis Surveys from Asia . If requested and thought appropriate, the comments will be included in the journal. We will be very happy if this journal stimulates global communication between scientists and engineers in the world of catalysis.