Fe3O4@nano-almondshell/Si(CH2)3/2-(1-piperazinyl)ethylamine as an effective magnetite almond shell-based nanocatalyst for the synthesis of dihydropyrano[3,2-c]chromene and tetrahydrobenzo[b]pyran derivatives

Abstract

The preparation and design of nano-catalysts based on magnetic biopolymers as green and biocompatible nano-catalysts have made many advances. This paper deals with the preparation of magnetite biopolymer-based Brønsted base nano-catalyst from a nano-almond (Prunus dulcis) shell. This magnetite biopolymer-based nano-catalyst was obtained through a simple process based on the core-shelling of nano-almond shell and Fe3O4 NPs and then the immobilization of 3-chloropropyltrimethoxysilane as linker and 2-aminoethylpiperazine as a basic section. Structural and morphological analysis of this magnetite biopolymer-based nano-catalyst were done using Fourier transform infrared spectroscopy, field emission scanning electron microscopy, X-ray diffraction, Thermogravimetric analysis, Vibrating sample magnetization, Energy-dispersive X-ray spectroscopy, Brunauer–Emmett–Teller, and Transmission electron microscopy techniques. The performance of the synthesized Fe3O4@nano-almondshell/Si(CH2)3/2-(1-piperazinyl)ethylamine as a novel magnetite biopolymer-based nano-catalyst for the synthesis of dihydropyrano[3,2-c]chromene and tetrahydrobenzo[b]pyran was investigated and showed excellent efficiency.

Hyperbranched 5-sulfosalicylic acid-TDI-chitosan decorated by Fe3O4 nanoparticles: a highly efficient solid acid organocatalyst for the synthesis of quinazoline derivatives under green conditions

“…Among these, heterogeneous catalytic systems and associated magnetic nanoparticles (MNP) have received great attraction from scientists recently, since they have unique properties including high thermal stability, structural diversity, easy modi cations, strong absorption, low toxicity, and a variety of advantages such as ease of separation and reusability [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] . Moreover, the designed-procedures for the preparation of nanomaterials including magnetic nanoparticles and their catalytic activities are entirely veri ed in the eld of greener and atom-economic reactions especially multicomponent reactions (MCRs) 12,21,[40][41][42][43][44][45][46][47] .This impact would be more deepened if the naturally occurring, renewable and biodegradable biopolymers such as chitosan, cellulose, alginate, etc be used in the structure of magnetic nanomaterials 12,23,34,[48][49][50] .…”