Synthesis and characterization of the immobilized Ni–Zn–Fe layered double hydroxide (LDH) on silica-coated magnetite as a mesoporous and magnetically reusable catalyst for the preparation of benzylidenemalononitriles and bisdimedones (tetraketones) under green conditions
作者:Masumeh Gilanizadeh、Behzad Zeynizadeh
DOI:10.1039/c8nj00788h
日期:——
Magnetic Fe3O4@SiO2@Ni–Zn–Fe LDH was prepared as an efficient nanocatalyst for the Knoevenagel and tandem Knoevenagel–Michael reactions to afford the products in water.
Enhanced catalytic activity of bio-fabricated ZnO NPs prepared by ultrasound-assisted route for the synthesis of tetraketone and benzylidenemalonitrile in hydrotropic aqueous medium
作者:Suraj R. Attar、Bipin Shinde、Santosh B. Kamble
DOI:10.1007/s11164-020-04233-5
日期:2020.10
co-precipitation method in aqueousmedium. Different morphological forms of ZnO NPs were characterized by XRD, TGA, FESEM, EDX, FTIR, UV–Vis and BET. Neem (Azadirachta indica) leaf extract and ultrasoundirradiation have a crucial role in the formation of different morphologies of ZnO NPs. ZnO NPs synthesized from plant extract and hydrotrope show a synergistic effect that leads to efficientsynthesis of benzylidenemalonitrile
Introduction of an efficient DABCO-based bis-dicationic ionic salt catalyst for the synthesis of arylidenemalononitrile, pyran and polyhydroquinoline derivatives
Abstract —An affordable DABCO-based bis-dicationic ionic salt ([(DABCO)2C3H5OH]·2Cl) was utilized for the synthesis of arylidenemalononitrile, tetrahydrobenzo[b]pyran, pyrano[2,3-d]-pyrimidinone (thione), dihydropyrano[3,2-c]chromene, and polyhydroquinoline derivatives. The significant features of the presented method are ease of preparation and handling of the catalyst, high catalytic activity, short
Binary copper and iron oxides immobilized on silica-layered magnetite as a new reusable heterogeneous nanostructure catalyst for the Knoevenagel condensation in water
作者:Masumeh Gilanizadeh、Behzad Zeynizadeh
DOI:10.1007/s11164-018-3475-0
日期:2018.10
Abstract In this study, a novel heterogeneous and reusable nanostructurecatalyst was synthesized through the immobilization of bimetallic Cu–Fe mixed oxides on silica-layered magnetite. The prepared nanomagnetic Fe3O4@SiO2@CuO–Fe2O3 was characterized using Fourier-transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction, Brunauer–Emmett–Teller
摘要 在本研究中,通过将双金属Cu-Fe混合氧化物固定在二氧化硅层磁铁矿上,合成了一种新型的均相且可重复使用的纳米结构催化剂。制备的纳米磁性Fe 3 O 4 @SiO 2 @ CuO–Fe 2 O 3使用傅里叶变换红外光谱仪,扫描电子显微镜,能量色散X射线光谱仪(EDX),X射线衍射,Brunauer–Emmett–Teller分析,热重分析,差示热引力,振动样品磁力计,透射电子进行表征显微镜和电感耦合等离子体发射光谱。在芳香醛和丙二腈在水中的Knoevenagel缩合反应中研究了这种介孔纳米复合材料的催化活性,从而以高收率或优异的收率获得了亚苄基丙二腈。纳米催化剂能够循环使用五次而不会显着降低催化活性。这种纳米结构催化剂可实现温和的反应条件和可接受的反应时间, 图形概要
A [4+2] Condensation Strategy to Imine-Linked Single-Crystalline Zeolite-Like Zinc Phosphate Frameworks
作者:Ritambhara Jangir、Alok Ch. Kalita、Dhananjayan Kaleeswaran、Sandeep K. Gupta、Ramaswamy Murugavel
DOI:10.1002/chem.201800149
日期:2018.4.20
reaction of 1 b with L5 leads to the isolation of a 2D‐boxed‐sheet coordination polymer [Zn4(dipp)4(L5)2]n (7). Selectiveformation of 3D‐framework 5′ from L3 and the 2D‐framework 7 from L5 is due to the angles created by the coordination of para‐ and meta‐pyridyl nitrogen centers at the zinc centers of the D4R cubane. Compound 5′ has been utilized as a catalyst for Knoevenagel condensation.