A hybrid magnetic material γFe2O3@Sh@cu2O was easily prepared from Shilajit (Sh) decorated Fe3O4 and copper acetate. The prepared magnetic hybrid material was fully characterized using different analysis, including Fourier transform infrared (FT-IR), X-ray diffraction (XRD), inductively coupled plasma (ICP), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM) thermal gravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET). All these analysis revealed that during coating of Fe3O4@Sh using copper salt (II), synchronized redox sorption of CuII to CuI occurs at the same time as the oxidation of Fe3O4 to γFe2O3. This magnetic catalyst exhibited excellent catalytic activity for regioselective synthesis of 1,4-disubstituted-1,2,3-triazoles via one pot three-component click reaction of sodium azide, terminal alkynes and benzyl halides in the absence of any reducing agent. High yields, short reaction time, high turnover number and frequency (TON = 3.5 * 105 and TOF = 1.0 * 106 h-1 respectively), easy separation, and efficient recycling of the catalyst are the strengths of the present method.

中文翻译：

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磁性γFe2O3@ Sh @ Cu2O：一种高效的固相催化剂，用于还原剂和无碱点击合成1,4-二取代-1,2,3-三唑。

由Shilajit（Sh）装饰的Fe3O4和乙酸铜可以轻松地制备杂化磁性材料γFe2O3@ Sh @ cu2O。使用不同的分析方法对制备的磁性杂化材料进行了全面表征，包括傅立叶变换红外（FT-IR），X射线衍射（XRD），电感耦合等离子体（ICP），扫描电子显微镜（SEM），能量色散X射线光谱仪（EDX），X射线光电子能谱仪（XPS），振动样品磁力计（VSM）热重量分析（TGA）和Brunauer-Emmett-Teller（BET）。所有这些分析表明，在使用铜盐（II）涂覆Fe3O4 @ Sh的过程中，CuII同步氧化还原吸附到CuI的过程与Fe3O4氧化成γFe2O3的同时发生。该磁性催化剂对1,4-二取代的1,2，在没有任何还原剂的情况下，通过叠氮化钠，末端炔烃和苄基卤化物的一锅三组分点击反应制得的3-三唑。高产率，短反应时间，高周转数和高频率（分别为TON ＝ 3.5×105和TOF ＝ 1.0×106h-1），易于分离和催化剂的有效循环是本方法的优点。