Highly stable magnetically separable copper nanocatalyst as an efficient catalyst for C(sp²)–C(sp) and C(sp²)–C(sp²) cross‐coupling reactions

Abstract

A copper catalyst has been explored as an efficient and recyclable catalyst to effect Sonogashira and Suzuki cross-coupling reactions. After modification of 2-(((piperazin-1-ylmethyl)imino)methyl)phenol (PP) on the surface of amorphous silica-coated iron oxide (Fe 3 O 4 @SiO 2 @Cl) magnetic core-shell nanocomposite, copper(II) chloride was employed to synthesize the Fe 3 O 4 @SiO 2 @PP-Cu catalyst, affording a copper loading of 1.52 mmol g −1 . High yield, low reaction times, nontoxicity and recyclability of the catalyst are the main merits of this protocol. The catalyst was characterized using Fourier transform infrared, X-ray photoelectron, energy-dispersive X-ray and inductively coupled plasma optical emission spectroscopies, X-ray diffraction, scanning and transmission electron microscopies, and vibrating sample magnetometry.

Boehmite@SiO2@ Tris (hydroxymethyl)aminomethane‐Cu(I): a novel, highly efficient and reusable nanocatalyst for the C‐C bond formation and the synthesis of 5‐substituted 1H‐tetrazoles in green media

“…[5,6] The use of copper catalysts for this transformation is still interesting from an industrial perspective because copper is cost-effective and less toxic than other transition metals. [13][14][15][16][17][18] Tetrazoles are an important class of heterocyclic compounds. [19][20][21][22] Recently, organic compounds containing tetrazole moiety have attracted increasing attention due to their wide range of applications in various areas of science.…”