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首页> 外文期刊>RSC Advances >The CuFe2O4@SiO2@ZrO2/SO42-/Cu nanoparticles: an efficient magnetically recyclable multifunctional Lewis/Bronsted acid nanocatalyst for the ligand- and Pd-free Sonogashira cross-coupling reaction in water
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The CuFe2O4@SiO2@ZrO2/SO42-/Cu nanoparticles: an efficient magnetically recyclable multifunctional Lewis/Bronsted acid nanocatalyst for the ligand- and Pd-free Sonogashira cross-coupling reaction in water

机译：CuFe2O4 //2 / SiO2 @ ZrO2 / SO42- / Cu纳米颗粒：用于在水中的配体和Pd的Sonogashira交叉偶联反应的高效磁性可再循环多功能路易斯/刚性酸纳米催化剂

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摘要

Herein, the synthesis and application of copper-incorporated sulfated zirconium oxide supported on CuFe2O4 NPs (CuFe2O4@SiO2@ZrO2/SO42-/Cu NPs) as a novel Lewis/Bronsted acid nanocatalyst were studied for the Sonogashira C-C cross-coupling reaction. The fabricated CuFe2O4@SiO2@ZrO2/SO42-/Cu catalyst exhibited efficient activity for a large variety of aryl iodides/bromides and, most importantly, aryl chlorides in water and in the presence of NaOH as a base in short reaction times. The catalyst was fully characterized by FTIR, TG-DTG, VSM, XRD, EDX, FE-SEM and TEM analyses. A synergetic effect could be considered to have arisen from the various Lewis acid and Bronsted acid sites present in the catalyst. The efficient incorporation of copper into zirconia provided a robust highly stable hybrid, which prevented any metal leaching, whether from the magnetite moiety and/or Cu sites in the reaction mixture. Moreover, the catalyst was successfully recovered from the mixture by a simple external magnet and reused for at least 9 consecutive runs. Zero metal leaching, stability, consistency with a variety of substrates, fast performance, cost-effectiveness, environmental friendliness, and preparation with accessible and cheap materials are some of the advantages and highlights of the current protocol.
机译：本文研究了Sonogashira C-C交叉偶联反应的CuFe2O4 NPS（CuFe2O4 NPS（CuFe2O4，CuF2O4 / SO42- / Cu NPS）中负载的铜掺入的硫酸化氧化锆的合成及应用。制造的CuFe2O4 / ZrO2 / SO42- / Cu催化剂对大量芳基碘/溴化物的有效活性表现出高效的活性，并且最重要的是，在水中的芳基氯和在NaOH在短反应时间内作为碱存在。催化剂通过FTIR，TG-DTG，VSM，XRD，EDX，Fe-SEM和TEM分析完全表征。可以认为协同效应来自催化剂中存在的各种路易斯酸和抗正囊位点。将铜的有效掺入氧化锆提供稳健的高度稳定的杂种，其防止任何金属浸出，无论是来自反应混合物中的磁铁矿部分和/或Cu位点。此外，通过简单的外部磁铁成功地从混合物中回收催化剂，并将至少9个连续运行重复使用。零金属浸出，稳定性，与各种基板的一致性，快速性能，成本效益，环境友好性以及具有可访问和廉价材料的准备是当前协议的一些优点和亮点。

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