Fe<sub>3</sub>O<sub>4</sub>@nSiO<sub>2</sub>@mSiO<sub>2</sub>/DBU: A Novel and Effective Basic Magnetic Nanocatalyst in the Multicomponent One Pot Synthesis of Polyhydroacridines and Polyhydroquinolines
Mehran Honari, Ali Reza Kiasat, Haleh Sanaeishoar, Mohammad Kazem Mohammadi
Abstract
In this research work, magnetic nanoparticles (NPs) of Fe3O4@nSiO2@mSiO2/DBU were designed as a novel effective heterogeneous catalyst for the production of polyhydroacridines and polyhydroquinolines. For characterizing the NPs, the Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscope (TEM), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and N2 adsorption–desorption measurement (BET isotherm) techniques were used. Some advantages of this magnetic nanoparticle include: use of commercially available materials to make catalysts, appropriate and simple operation, excellent yields, appropriate catalytic activity, simple work-up, and recycle and reuse the catalyst up to seven times without considerable change in its catalytic activity.