Copper Schiff base complex immobilized on silica‐coated Fe₃O₄ nanoparticles: a recoverable and efficient catalyst for synthesis of polysubstituted pyrroles

Abstract

In this work, a copper Schiff base complex immobilized on silica‐coated Fe3O4 nanoparticles is synthesized, and studied as a highly efficient, recyclable, green and heterogeneous catalyst for the preparation of polysubstituted pyrroles under solvent‐free and mild conditions. This new catalyst was characterized by different techniques, such as Fourier transform infrared (FT‐IR), X‐ray powder diffraction (XRD), field‐emission scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDX), inductively coupled plasma (ICP) and vibrating sample magnetometry (VSM). The simple and environmentally one‐pot multicomponent condensation of nitromethane, an aryl aldehyde, a 1,3‐dicarbonyl compound and an amine in the presence of above catalyst affords the title compounds at room temperature. At the end, we compared the results for the synthesis of polysubstituted pyrroles in the presence of our nanocatalyst with previously reported catalysts in the literature.

Application of β‐Nitrostyrene in Multicomponent Reactions for the Synthesis of Pyrrole Derivatives

“…Then, the optimum amount of catalyst was tested in H 2 O, EtOH, CH 3 CN, CH 2 Cl 2 , toluene and n ‐hexane solvents that the best yield was obtained in solvent‐free conditions (Scheme ). The catalyst was recovered for the five runs without significant loss in catalytic activity …”

Effective one‐pot synthesis of tetrahydrobenzo[b]pyran derivatives using nickel Schiff‐base complex immobilized on iron oxide nanoparticles

“…In continuation of our research on the design and synthesis of Schiff-base complexes immobilized on MNPs, [26,41] we decided to synthesis and characterized new nickel Schiff-base complex supported on MNPs as a benign and recoverable catalyst in the synthesis of tetrahydrobenzo[b]pyran derivatives. It is noteworthy that different aldehydes have been used in the synthesis of the mentioned derivatives.…”

Template-Free Fabrication of Refractive Index Tunable Polysiloxane Coating Using Homogeneous Embedding Strategy: Application in High-Power Laser System

“…Silica-based coatings are widely applied in the fields of photovoltaics [1,2], LEDs [3], lasers [4,5], energy and fuel [6,7], catalysts [8], and corrosion protection [9], owing to its excellent optical and mechanical properties. In addition, the extraordinary laser damage resistance of silica-based coatings makes it very popular in high-power laser systems as an antireflective (AR) coating [10][11][12], in which precise matching of the refractive index (RI) and thickness for each layer is fundamental to achieve ultrahigh transmission at desired wavelengths.…”