活性炭负载硫化锡纳米颗粒作为高效可重复使用Lewis酸催化剂催化三组分一锅法合成4H-吡喃[2,3-c]吡唑衍生物(英文)  

Tin sulfide nanoparticles supported on activated carbon as an efficient and reusable Lewis acid catalyst for three-component one-pot synthesis of 4H-pyrano[2,3-c]pyrazole derivatives

作　　者：Nasir Iravani Mosadegh Keshavarz Hossein Ali Shojaeian Kish Rasool Parandvar 

机构地区：[1]Department of Chemistry, Faculty of Science, Gachsaran Branch, Islamic Azad University [2]Department of Gas and Petroleum, Yasouj University [3]Young and Reasearcers Elite, Gachsaran Branch, Islamic Azad University

出　　处：《催化学报》2015年第4期626-633,共8页

基　　金：Islamic Azad University, Gachsaran Branch;the Research Council of Yasouj University for financial support

摘　　要：Tin sulfide nanoparticles(SnS -NPs) were prepared in aqueous solution at room temperature on the surface of activated carbon(AC) and were investigated using field-emission scanning electron mi-croscopy(FE-SEM), transmission electron microscopy(TEM), X-ray diffraction, reflective ultravio-let-visible spectrophotometry, and spectrofluorimetry. Calculations based on the SEM and TEM images showed that the sizes of the SnS -NPs immobilized on the AC were 30–70 nm. The prepared nanocomposite was used as a heterogeneous Lewis acid catalyst for the three-components one-pot synthesis of 4H-pyrano[2,3-c]pyrazole derivatives in ethanol at 80 ℃. The reactions were efficiently performed in the presence of the prepared catalyst in short reaction times, and gave the desired products in high yields. This catalyst can be easily recovered by simple filtration and recycled up to eight consecutive times without significant loss of its efficiency.Tin sulfide nanoparticles（SnS -NPs） were prepared in aqueous solution at room temperature on the surface of activated carbon（AC） and were investigated using field-emission scanning electron mi-croscopy（FE-SEM）, transmission electron microscopy（TEM）, X-ray diffraction, reflective ultravio-let-visible spectrophotometry, and spectrofluorimetry. Calculations based on the SEM and TEM images showed that the sizes of the SnS -NPs immobilized on the AC were 30–70 nm. The prepared nanocomposite was used as a heterogeneous Lewis acid catalyst for the three-components one-pot synthesis of 4H-pyrano[2,3-c]pyrazole derivatives in ethanol at 80 ℃. The reactions were efficiently performed in the presence of the prepared catalyst in short reaction times, and gave the desired products in high yields. This catalyst can be easily recovered by simple filtration and recycled up to eight consecutive times without significant loss of its efficiency.

关 键 词：路易斯酸催化剂 吡唑衍生物 纳米颗粒 一锅合成 三组分 硫化物 活性炭 可重复使用 

分 类 号：O626[理学—有机化学] O643.36[理学—化学]