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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >A highly effective synthesis of pyrimido[4,5-b]quinoline-tetraones using H3PW12O40/chitosan/NiCo2O4 as a novel magnetic nanocomposite
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A highly effective synthesis of pyrimido[4,5-b]quinoline-tetraones using H3PW12O40/chitosan/NiCo2O4 as a novel magnetic nanocomposite

机译：使用H3PW12O40 /壳聚糖/ NiCO2O4作为新型磁性纳米复合材料的高效合成嘧啶[4,5-B]喹啉 - 四元素

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In this research an efficient, robust, recoverable and magnetic nanocomposite, containing 12-phosphotungstic acid functionalized chitosan@NiCo2O4 NPs (PWA/CS/NiCo2O4), has been reported for the multi component reaction of aromatic aldehydes, 6-aminouracil or 6-amino-1,3-dimethyluracil with 2-hydroxy-1,4-naphthoquinone under reflux conditions. The present approach offers several advantages, such as simple procedure, green solvent, simple purification, excellent yield of products and short reaction times. In addition, the organic products were obtained easily, without the need of column chromatography, in good-to-excellent yields. The structure and characterization of the recoverable magnetically nanocatalyst, H3PW12O40/chitosan/NiCo2O4, have been done by using various spectroscopic techniques, which include Fourier transform infrared spectrophotometry (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and vibrating sample magnetometry (VSM) analysis methods. The obtained magnetic nanocomposite showed excellent catalytic activity as a new heterogeneous catalyst and can be separated from the reaction system with a simple external magnet. It is also confirmed that H3PW12O40/chitosan/NiCo2O4 could be reused without any significant loss in its activity. (C) 2020 Published by Elsevier Ltd.
机译：在该研究中，已经报道了含有12-磷钨酸官能化的壳聚糖官能化的壳聚糖，芳香醛，6-氨基脲或6-氨基的多重组分反应，含有12-磷钨酸官能化的壳聚糖（PWA / Cs / Nico2O4）的有效，鲁棒，可恢复和磁性纳米复合材料-1,3-二甲基脲，其中2-羟基-1,4-萘醌在回流条件下。目前的方法提供了几种优点，如简单的程序，绿色溶剂，简单净化，产品的优异产量和较短的反应时间。此外，有机产物容易获得，无需柱色谱，以良好的产率。通过使用各种光谱技术，通过使用各种光谱技术来完成可回收磁性纳米催化剂H3PW12O40 /壳聚糖/ NicO 2 O 4的结构和表征，该方法包括傅里叶变换红外分光光度法（FT-IR），扫描电子显微镜（SEM），X射线衍射（XRD ），能量分散X射线光谱（EDX）和振动样品磁体（VSM）分析方法。所得磁性纳米复合材料显示出优异的催化活性作为新的异质催化剂，可以用简单的外部磁铁与反应系统分离。还证实H3PW12O40 /壳聚糖/ NicO2O4可以重复使用，而不在其活动中没有任何显着损失。 （c）2020由elestvier有限公司发布

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