Dandia Anshu, Bansal Sarika, Sharma Ruchi, Rathore Kuldeep S, Parewa Vijay
Centre of Advanced Studies, Department of Chemistry, University of Rajasthan Jaipur India
Department of Physics, Arya College of Engineering and IT Jaipur India
RSC Adv. 2018 Aug 29;8(53):30280-30288. doi: 10.1039/c8ra05203d. eCollection 2018 Aug 24.
A CuO NP decorated reduced graphene oxide (CuO NPs/rGO) composite was synthesized and characterized using various analytical techniques XRD, TEM, SEM, UV-Vis, FT-IR, EDX, XPS and CV. The activity of the catalyst was probed for the Petasis-Borono-Mannich (PBM) reaction of boronic acids, salicylaldehydes, and amines under microwave irradiation (MW). The CuO NPs/rGO composite works as a catalyst as well as a susceptor and augments the overall ability of the reaction mixture to absorb MW. The synergistic effect of MW and CuO NPs/rGO resulted in an excellent outcome of the reaction as indicated by the high TOF value (3.64 × 10 mol g min). The catalytic activity of the CuO NPs/rGO composite was about 12-fold higher under MW compared to the conventional method. The catalyst was recovered by simple filtration and recycled 8 times without significant loss in activity. This atom-economical protocol includes a much milder procedure, and a catalyst benign in nature, does not involve any tedious work-up for purification, and avoids hazardous reagents/byproducts and the target molecules were obtained in good to excellent yields.
合成了一种氧化铜纳米颗粒修饰的还原氧化石墨烯（CuO NPs/rGO）复合材料，并使用各种分析技术（XRD、TEM、SEM、UV-Vis、FT-IR、EDX、XPS和CV）对其进行了表征。在微波辐射（MW）下，考察了该催化剂对硼酸、水杨醛和胺的Petasis-硼基-曼尼希（PBM）反应的活性。CuO NPs/rGO复合材料既作为催化剂又作为感受器，增强了反应混合物吸收微波的整体能力。微波和CuO NPs/rGO的协同作用导致反应取得了优异的结果，高TOF值（3.64×10 mol g min）表明了这一点。与传统方法相比，CuO NPs/rGO复合材料在微波下的催化活性高出约12倍。通过简单过滤回收催化剂，并循环使用8次，活性没有明显损失。这种原子经济的方法包括一个温和得多的过程，并且催化剂性质良性，不涉及任何繁琐的纯化后处理，避免了危险试剂/副产物，目标分子以良好到优异的产率得到。
