Abstract
A hybrid system was designed and synthesized through reacting modified halloysite (Hal-Cl) with Schiff base (DAB-PC) and applied as catalytic support for anchoring Pd NPs to afford Pd@Hal-DAB-PC catalyst. The resultant material was well identified by various analyses including Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction patterns (XRD), thermogravimetric analysis (TGA), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and inductively coupled plasma-optical emission spectrometry (ICP-OES) and revealed outstanding catalytic activity in the Sonogashira reaction in aqueous media. Also, This nanocatalyst was simply collected and recycled up to six runs with a slight drop in efficiency, indicating the durability of Pd@Hal-DAB-PC.
Highlights
A hybrid system was designed and synthesized through reacting modified halloysite (Hal-Cl) with Schiff base (DAB-PC) and applied as catalytic support for anchoring Pd NPs to afford Pd@HalDAB-PC catalyst
As a part of our efforts towards developing environmentally–friendly catalytic systems for chemical transformations, such as cross-coupling reactions[26,27,28,29,30], we described the fabrication of a novel heterogeneous catalyst, Pd@Hal-DAB-PC, using a multi-step modification of halloysite and stabilization of Pd NPs (Scheme 1) and its utilization in the Sonogashira reaction
All the materials utilized for the fabrication of the catalyst and doing Sonogashira reactions, such as Hal, CPTES, 1H-benzimidazole-2,5-diamine (DAB), pyridine-2-carbaldehyde (PC), triethylamine, palladium chloride, aryl halides, propargyl alcohol, phenylacetylene, NaOH, K2CO3, toluene, ethanol, and methanol were obtained from Sigma‐Aldrich and applied as supplied
Summary
A hybrid system was designed and synthesized through reacting modified halloysite (Hal-Cl) with Schiff base (DAB-PC) and applied as catalytic support for anchoring Pd NPs to afford Pd@HalDAB-PC catalyst. As a part of our efforts towards developing environmentally–friendly catalytic systems for chemical transformations, such as cross-coupling reactions[26,27,28,29,30], we described the fabrication of a novel heterogeneous catalyst, Pd@Hal-DAB-PC, using a multi-step modification of halloysite and stabilization of Pd NPs (Scheme 1) and its utilization in the Sonogashira reaction.
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