制备了一种新型的可重复使用的绿色聚苯胺(PANI)/ Fe 3 O 4 /碳纳米管(CNT)纳米磁性催化剂,其特征在于具有傅里叶变换红外光谱(FT-IR),透射电子显微镜(TEM)和X-射线衍射(XRD)分析,并用于由靛红,水合肼或苯肼,乙酰乙酸乙酯和丙二腈或乙基四氢吡咯并[吲哚啉-3,4'-吡喃并[2,3- c ]吡唑]衍生物的四组分合成在室温下于水性介质中使用氰基乙酸盐。使用水作为安全且对环境无害的溶剂,反应时间短,产物收率高,后处理步骤容易,催化剂易于分离和可重复使用是该方法的显着优势。
A bioglycerol derived carbon-sulfonic acid is found to catalyze efficiently the three-component one-pot condensation of isatin, malononitrile, and 1,3-dicarbonyls to afford a wide range of spiro[4H-pyran-3,3′-oxindole]derivatives in good yields and selectivity. The use of a recyclable solid acid catalyst makes this method simple, convenient, and cost-effective.
Design and development of a new functionalized cellulose-based magnetic nanocomposite: preparation, characterization, and catalytic application in the synthesis of diverse pyrano[2,3-c]pyrazole derivatives
作者:Ali Maleki、Vahid Eskandarpour
DOI:10.1007/s13738-019-01610-9
日期:2019.7
for the preparation of a new cellulose-based functionalized magnetic nanocomposite catalyst is described. The structure and morphology of the prepared nanomaterial was characterized by scanning electron microscopy, energy-dispersive X-ray analysis, X-ray diffraction patterns, and Fourier transform infrared spectroscopy analyses. Then, its catalytic activity was investigated in the synthesis of 2,4-dihydropyrano[2
characterized by Fourier-transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) analysis, and applied for four-component synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives from isatin, hydrazine hydrate or phenylhydrazine, ethyl acetoacetate, and malononitrile or ethyl cyanoacetate in aqueous medium at room temperature. Use of water as safe
制备了一种新型的可重复使用的绿色聚苯胺(PANI)/ Fe 3 O 4 /碳纳米管(CNT)纳米磁性催化剂,其特征在于具有傅里叶变换红外光谱(FT-IR),透射电子显微镜(TEM)和X-射线衍射(XRD)分析,并用于由靛红,水合肼或苯肼,乙酰乙酸乙酯和丙二腈或乙基四氢吡咯并[吲哚啉-3,4'-吡喃并[2,3- c ]吡唑]衍生物的四组分合成在室温下于水性介质中使用氰基乙酸盐。使用水作为安全且对环境无害的溶剂,反应时间短,产物收率高,后处理步骤容易,催化剂易于分离和可重复使用是该方法的显着优势。
The investigation of substituent effect in the structure of copolymer as the protecting cover of magnetic nanocomposite on its catalytic activity
(B) nanocomposites have been synthesized and characterized by FT‐IR, SEM, EDS, VSM, TGA and BET techniques. Their catalytic activity has been evaluated in the synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives and compared together to show the substituenteffect in the structure of copolymer as the cover of CNT-Fe3O4. The one‐pot four‐component condensation of isatin, hydrazine hydrate
合成了两种磁性 CNT-Fe 3 O 4 @Poly(Py-co-Ani) (A) 和 CNT-Fe 3 O 4 @Poly(Py-co-Ani-NO 2 ) (B) 纳米复合材料并通过 FT 表征‐IR、SEM、EDS、VSM、TGA 和 BET 技术。它们的催化活性已在螺[二氢吲哚-3,4'-吡喃并[2,3-c]吡唑]衍生物的合成中进行了评估,并一起进行了比较,以显示作为CNT-Fe覆盖层的共聚物结构中的取代基效应3 O 4. 在这两种纳米复合材料的存在下,室温下在水性介质中进行靛红、水合肼、乙酰乙酸乙酯和丙二腈或氰基乙酸乙酯的一锅四组分缩合反应,在两种方法中均以良好至极好的产率生成相应的产物个案。目前的方法具有几个优点,例如产品收率高、反应时间短、使用水作为绿色溶剂、易于处理程序和可重复使用以及由于催化剂的磁性而从反应混合物中磁性分离。