Fe3O4/SiO2 decorated trimesic acid-melamine nanocomposite: A reusable supramolecular organocatalyst for efficient multicomponent synthesis of imidazole derivatives

Abstract

This article describes supramolecular Fe3O4/SiO2 decorated trimesic acid-melamine nanocomposite that can be prepared with features that combine properties of different materials to fabricate a structurally unique hybrid material. In particular, we have focused on design, synthesis and evaluation a heterogeneous magnetic organocatalyst with acidic functional-groups for synthesis of biologically important imidazole derivatives in good-to-excellent yields. The introduced Fe3O4/SiO2-TMA-Me were characterized by different techniques such as FTIR, XRD, EDX, FESEM, TEM and TGA. As a noteworthy point, the magnetic catalyst system can be recycled and reused for more than seven consecutive cycles while its high catalytic activity remains.

Tannic acid-poly ethyleneimine magnetic nanoparticles: an efficient and recyclable catalyst for green synthesis of 2,3-dihydroquinazole derivatives

“…The latest feature being very important due to the high price of the catalytic system that cannot be recovered readily [24][25][26][27] .One of the drawbacks in the application of MNPs is the agglomeration under magnetic elds, which leads to a decrease in the surface-to-volume ratio and subsequently to a decrease in its catalytic activity 28 . Therefore, to prevent mentioned aggregation, MNPs must be stabilized by coating with a protecting layer including carbon layers [29][30] , organic polymers [31][32][33] or silica 23,[34][35][36][37][38][39][40] .…”