Template‐less synthesis of polymer hollow spheres: an efficient catalyst for Suzuki coupling reaction

Abstract

We report here a method for the preparation of polymer hollow spheres in which 3-aminoquinoline (3-AQ) and palladium acetate were used as precursors. During the reaction 3-AQ was oxidized and formed poly(3-AQ). IR and Raman spectra provided information on the chemical structure of the polymer. The oxidation state of palladium was confirmed by X-ray photoelectron spectroscopic analysis. Transmission and scanning electron microscopy were used to determine the size and morphology of the polymer. The palladium-poly(3-AQ) supramolecular system was used as an effective catalyst for the Suzuki coupling reaction of aryl halides in the absence of a phosphine ligand.

Synthesis and Characterization and Thermal Decomposition Kinetics of Poly (quinoline)-Copper Composite

“…Irregular shaped, heterogeneous and micro-sized platelike structures were observed from this Figure. EDX analysis assigned the existence of copper, carbon, nitrogen and sulfur atoms on the surface of the product (Figure 3). This morphology is different from previous studies [6,7,9]. The thickness and the length of rods observed at Figure 4 were around 200-400 nm, 4-6µm, respectively.…”

“…The characteristic benzenoid and quinoid vibrations were observed at 1619 and 1511 cm -1 . The peak at 1275 cm -1 was also observed possibly due to C-N stretching vibration [7]. In addition, the peak observed at 1373 cm -1 with medium intensity was assigned to C-N stretching for quinoid ring and harmony with literature [7].…”

Polymer‐Stabilized Palladium Nanoparticles for the Chemoselective Transfer Hydrogenation of α,β‐Unsaturated Carbonyls: Single‐Step Bottom‐Up Approach

“…In association with our ongoing research on the development of effective catalysts for synthetic organic transformations,25, 26, 28–33 we have found that a polypyrrole‐immobilised Pd nanoparticle catalyst can be used for the chemoselective transfer hydrogenation of α,β‐unsaturated carbonyls in the presence of NH 4 OOCH or HCOOH under reflux conditions. The interesting aspect of this catalyst is that it can selectively hydrogenate the olefins or acetylenes without affecting the carbonyl moiety and ArX (X=Cl, Br) bonds with an excellent yield of products for a wide range of substrates.…”

“…The polymer matrix serves both as the support as well as the stabiliser of the nanoparticles, which provides a mechanism to prevent aggregation. Pd‐based catalysts, in particular nano‐sized Pd particles, have recently drawn a great deal of attention because of their versatile role in organic synthesis 28–33. Pd‐catalysed hydrogenation reactions are important for industrial applications 34–36.…”

Recognition of biomolecules using gold-polymer composites: metal nanoparticles play the role of the catalyst

“…Such composite architecture shows various properties directly relevant and of benefit to energy storage [9] and catalytic activity [10][11][12][13][14][15][16]. Nanoparticles, such as gold and silver, with the unique optical property and the sizedependent electrochemistry have made them the ideal system of choice in the area of sensor application for biomolecule recognition.…”