Cu-grafted mesoporous organic polymer: a new recyclable nanocatalyst for multi-component, N-arylation and S-arylation reactions

Abstract

A new mesoporous Cu-MPTA-1 nanocatalyst has been synthesized via a simple and facile in situ radical polymerization of triallylamine in the presence of an organic-organic self-assembly of anionic surfactant SDS, followed by grafting of Cu(II) at room temperature under an inert atmosphere. This nanomaterial has been characterized by elemental analysis, powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-vis diffuse reflectance spectroscopy (DRS), thermogravimetric analysis (TGA), N 2 adsorption-desorption studies, X-ray photoelectron spectroscopy (XPS) and EPR spectroscopy. Cu-MPTA-1 acts as an efficient heterogeneous nanocatalyst exhibiting a high catalytic activity for N-arylation and S-arylation reactions using water as a green solvent and also exhibits an excellent catalytic activity for the one-pot synthesis of propargylamines via a three component coupling of an alkyne, an amine and an aldehyde at room temperature.Moreover, the catalyst is easily recoverable and can be reused six times without an appreciable loss of catalytic activity in the three component coupling reaction. The highly dispersed Cu(II) sites in the Cu-grafted mesoporous polymer could be responsible for the observed high activities of the Cu-MPTA-1 catalyst in the coupling reactions.No evidence of leached Cu from the catalyst during the course of the reaction has been observed, suggesting true heterogeneity in the catalytic process.

De Novo Synthesis of Gold‐Nanoparticle‐Embedded, Nitrogen‐Doped Nanoporous Carbon Nanoparticles (Au@NC) with Enhanced Reduction Ability

“…To demonstrate the catalytic ability of all samples, the conversion of 4‐nitrophenol into 4‐aminophenol was chosen as the model reduction reaction . The UV/Vis spectra of the reduction of 4‐nitrophenol catalyzed by Au@NC at different time periods are shown in Figure a.…”

Cu(II) Schiff base complex supported on Fe3O4 nanoparticles as an efficient nanocatalyst for the selective aerobic oxidation of alcohols

“…To evaluate the efficiency of our protocol with respect to other reported systems, we compared the oxidation of benzyl alcohol in Table . As it can be seen from Table , it is obvious that the described procedure in this research has attractive benefits, including high conversion and selectivity, short reaction time, easy separation of the nanocatalyst from reaction media with high TOF under mild condition.…”

Synthesis, Characterization and Catalytic Studies of Heterogeneous Oxo‐Vanadium(IV) Schiff base Catalyst for Activation of Benzylic C‐H bonds of Alkanes

“…Since heterogeneous vanadium catalysts exhibit significant activity in various oxidation reactions, so we have investigated the potential activity of this polymer supported oxo‐ vanadium(IV) catalyst in the oxidation of toluene. At first, reaction conditions for the activation of benzylic C−H bonds of toluene were varied and optimized by means of different experimental conditions such as various solvents and oxidants, amount of catalyst and temperature.…”