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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

Abstract

Novel magnetic Fe3O4@SiO2@Ni-Zn-Fe layered double hydroxide (LDH) intercalated with water molecules and carbonate anions as interlayer contents was prepared as a new heterogeneous and separable nanocatalyst. The mesoporous catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), Brunauer-Emmett-Teller (BET), vibration sample magnetometer (VSM), thermogravimetric analysis (TGA), differential thermal gravity (DTG) and transmission electron microscopy (TEM). The Knoevenagel and tandem Knoevenagel-Michael reactions have been carried out between aromatic aldehydes, malononitrile and dimedone by the magnetically reusable nanocatalyst in water as a green and eco-friendly solvent, to afford benzylidenemalononitrile and bisdimedone derivatives (tetraketones), respectively. Reusability and recoverability of the core-shell hydrotalcite was examined six times without considerable loss of its catalytic activity. This magnetic LDH catalyst in the promotion of titled transformations provides high yields, mild reaction conditions, satisfactory reaction times and high purity of the obtained products without utilizing any hazardous organic solvents.

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Publication details

The article was received on 15 Feb 2018, accepted on 06 Apr 2018 and first published on 06 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ00788H
Citation: New J. Chem., 2018, Accepted Manuscript
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    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

    M. Gilanizadeh and B. Zeynizadeh, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00788H

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