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Copper nanoparticles supported on highly nitrogen-rich covalent organic polymers as heterogeneous catalysts for the ipso-hydroxylation of phenyl boronic acid to phenol
New Journal of Chemistry ( IF 3.3 ) Pub Date : 2020-03-19 , DOI: 10.1039/c9nj05759e
Velu Sadhasivam 1, 2, 3, 4, 5 , Muniyasamy Harikrishnan 6, 7, 8, 9, 10 , Ganesan Elamathi 6, 7, 8, 9, 10 , Rajendran Balasaravanan 6, 7, 8, 9, 10 , Sepperumal Murugesan 6, 7, 8, 9, 10 , Ayyanar Siva 6, 7, 8, 9, 10
Affiliation  

This work describes a simple procedure for the synthesis of highly nitrogen-rich covalent organic polymers using commercially available starting materials like melamine and cyanuric chloride as a solid heterogeneous catalyst Cu/TCOP under solvothermal conditions. The structural properties of the as-synthesized solid heterogeneous catalyst were determined by X-ray diffraction (XRD), diffuse reflectance spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), 13C-CP MAS nuclear magnetic resonance spectroscopy and X-ray photoelectron spectroscopy. The catalytic activity of Cu/TCOP was investigated by focusing on the oxidation of phenylboronic acid under atmospheric conditions in an aqueous medium, achieving a very good yield up to 99%. The reaction performance was evaluated considering the effect of various parameters, such as the amount of the catalyst, reaction time, temperature, and the amount of the base and solvent. The Cu/TCOP catalyst is completely recoverable in a facile manner from the reaction mixture and the efficiency of the copper nanocatalyst can be recovered after five cycles.

中文翻译:

铜纳米颗粒负载在高度富氮的共价有机聚合物上,作为异质催化剂,用于苯基硼酸向羟基的苯酚羟基化

这项工作描述了一种简单的方法,用于在溶剂热条件下使用市售的起始原料(如三聚氰胺和氰尿酰氯)作为固体多相催化剂Cu / TCOP来合成高度富氮的共价有机聚合物。通过X射线衍射(XRD),漫反射光谱,傅立叶变换红外(FT-IR)光谱,场发射扫描电子显微镜(FESEM),能量色散X射线确定合成后的固体非均相催化剂的结构性能光谱(EDS),13C-CP MAS核磁共振光谱和X射线光电子能谱。Cu / TCOP的催化活性是通过集中于大气条件下在水性介质中苯硼酸的氧化来研究的,实现了高达99%的极高收率。考虑到各种参数的影响,例如催化剂的量,反应时间,温度以及碱和溶剂的量,评价反应性能。可以容易地从反应混合物中完全回收Cu / TCOP催化剂,并且可以在五个循环后回收铜纳米催化剂的效率。
更新日期:2020-03-19
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