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Fabrication of Ionic‐Liquid‐Embedded ZnO Nanoparticles: Application of a Synergistic Catalytic Effect to Thiol‐Induced 2‐Pyridone Synthesis
Asian Journal of Organic Chemistry ( IF 2.8 ) Pub Date : 2018-04-06 , DOI: 10.1002/ajoc.201700610 Priya Mondal 1 , Asim Bhaumik 2 , Sauvik Chatterjee 2 , Chhanda Mukhopadhyay 1
Asian Journal of Organic Chemistry ( IF 2.8 ) Pub Date : 2018-04-06 , DOI: 10.1002/ajoc.201700610 Priya Mondal 1 , Asim Bhaumik 2 , Sauvik Chatterjee 2 , Chhanda Mukhopadhyay 1
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This is the first report of thiol‐induced, recyclable ZnO–[2COOHMIM]+Br−‐catalysed (2COOHMIM=1‐(2‐carboxyethyl)‐3‐methylimidazolium), water‐mediated 2‐pyridone synthesis by two new straightforward strategies with 37 examples. This catalytic system was prepared using environmentally friendly, recyclable acidic‐ionic‐liquid‐coated ZnO nanoparticles (NPs). The changes in size and morphology upon capping the ZnO NPs were effectively tuned by neutral and acidic ionic liquids, which acted as structure‐directing mediators. ZnO has a high affinity for carboxyl functionalities, and accordingly, a 3D network was formed in which the carboxyl group acted as a linker. The catalysts generated by the capping of ZnO NPs with ionic liquids were characterised by scanning electron microscopy, transmission electron microscopy, dynamic light scattering, powder X‐ray diffraction, and FTIR spectroscopy. This combined catalytic system, containing both acidic and basic environments, exhibited properties of both a quasi‐heterogeneous catalyst and a phase‐transfer catalyst in aqueous medium. Here, a synergistic catalytic effect between ZnO NPs and acidic ionic liquids is utilised effectively. The recyclability of this catalytic system up to a fifth cycle was demonstrated by FTIR spectroscopy.
中文翻译：
离子液体嵌入的ZnO纳米粒子的制备：协同催化作用在硫醇诱导的2-吡啶酮合成中的应用
这是硫醇诱导的，可回收ZnO- [2COOHMIM]的第一次报告+溴-通过两个新的简单策略（37个实例）催化（2COOHMIM = 1-（2-羧乙基）-3-甲基咪唑鎓），水介导的2-吡啶酮合成。该催化体系是使用环保，可回收的酸性离子液体涂覆的ZnO纳米颗粒（NPs）制备的。ZnO NPs封端后，大小和形态的变化可以通过中性和酸性离子液体有效地调节，这些离子液体充当结构导向介质。ZnO对羧基官能团具有高亲和力，因此，形成了一个3D网络，其中羧基作为连接基。用扫描电镜，透射电镜，动态光散射，粉末X射线衍射和FTIR光谱对用离子液体封盖ZnO NPs生成的催化剂进行表征。这个组合的催化系统，包含酸性和碱性环境，在水性介质中均表现出准多相催化剂和相转移催化剂的特性。在此，可有效利用ZnO NP与酸性离子液体之间的协同催化作用。FTIR光谱证明了该催化系统的可循环性至第五个循环。
更新日期：2018-04-06
中文翻译：
离子液体嵌入的ZnO纳米粒子的制备：协同催化作用在硫醇诱导的2-吡啶酮合成中的应用
这是硫醇诱导的，可回收ZnO- [2COOHMIM]的第一次报告+溴-通过两个新的简单策略（37个实例）催化（2COOHMIM = 1-（2-羧乙基）-3-甲基咪唑鎓），水介导的2-吡啶酮合成。该催化体系是使用环保，可回收的酸性离子液体涂覆的ZnO纳米颗粒（NPs）制备的。ZnO NPs封端后，大小和形态的变化可以通过中性和酸性离子液体有效地调节，这些离子液体充当结构导向介质。ZnO对羧基官能团具有高亲和力，因此，形成了一个3D网络，其中羧基作为连接基。用扫描电镜，透射电镜，动态光散射，粉末X射线衍射和FTIR光谱对用离子液体封盖ZnO NPs生成的催化剂进行表征。这个组合的催化系统，包含酸性和碱性环境，在水性介质中均表现出准多相催化剂和相转移催化剂的特性。在此，可有效利用ZnO NP与酸性离子液体之间的协同催化作用。FTIR光谱证明了该催化系统的可循环性至第五个循环。
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