FNAOSiPPEA: an effective magnetite almond shell-based nano catalyst for the synthesis of dihydropyrano[3,2-c]chromene and tetrahydrobenzo[b]pyran

Abstract

This paper deals with the preparation of magnetite biopolymer-based Brønsted base nano-catalyst from 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 analyzes of this magnetite biopolymer-based nano-catalyst were done. The performance of the synthesized Fe3O4@nano-almondshell@OSi(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.