613-40-1Relevant articles and documents
Suzuki–Miyaura cross-coupling reaction assisted by palladium nanoparticles-decorated zeolite 13X nanocomposite: a greener approach
Deepika, Raja,Sethuraman, Mathur Gopalakrishnan
, (2022/01/22)
Heterogeneous catalysts govern the field of catalysis due to their easy separation from a reaction mixture, reusability, and prevention of agglomeration, making them more efficient catalysts than homogeneous catalysts. Herein, we report the eco-friendly synthesis of a novel heterogeneous catalyst, viz. palladium nanoparticles (Pd NPs) decorated over zeolite 13X nanocomposite using dried fruits of Terminalia chebula Retz. as the reducing and stabilizing agent and its performance as a promising catalyst for the Suzuki–Miyaura coupling reactions. The particle size, crystallinity, morphology, and textural properties of the catalyst were identified using Fourier transform-infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HR-TEM), thermal gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) analysis which confirmed the presence of palladium nanoparticles on the surface of zeolite 13X. The FESEM images revealed the presence of spherical-shaped Pd NPs over the cubical particles of zeolite 13X. The average particle size of the palladium nanoparticles was found to be in the range of 6–7?nm and was polycrystalline in nature. From BET analysis, it was inferred that the decoration of Pd NPs decreased the surface area of zeolite 13X (615.5 m2/g to 548.334 m2/g), thus leaving pores unoccupied. This study showed the efficiency of this novel catalyst in the formation of biaryl derivatives using low palladium loadings (0.0012?mol%) giving good to excellent yields (90–99%) within short reaction times (10–225?min) with high TONs (> 79,000) and TOFs (> 21,000). Both electron-donating and electron-withdrawing aryl halides and aryl boronic acids reacted smoothly in the presence of K2CO3 as a base and EtOH/H2O (1:1) as the solvent. Besides, the catalyst could be recycled and reused for 5 consecutive runs with minimal loss of its efficiency. The supremacy of this catalyst could well be exploited in future for various organic transformations. Graphical abstract: [Figure not available: see fulltext.].
Pd Nanoparticles Embedded Into MOF-808: Synthesis, Structural Characteristics, and Catalyst Properties for the Suzuki–Miyaura Coupling Reaction
Li, Tang,Pang, Wan,Wang, Jie,Zhang, Xiaoli,Zhao, Zesheng
, (2021/07/31)
Abstract: A heterogeneous single-site catalyst Pd@MOF-808 was successfully synthesized by water-based, green synthesis procedure. The catalytic experiments exhibited the Pd@MOF-808 promoted efficiently the Suzuki–Miyaura coupling reaction without the assistance of organic phosphine ligands at atmospheric pressure conditions. The catalyst also could be applied in the gram-scale synthesis of industrially anti-inflanmatory analgestic Fenbufen. Graphic Abstract: [Figure not available: see fulltext.]
Design and synthesis of immobilised orthopalladated catalyst for C–C coupling
Pattanayak, Poulami,Parua, Sankar Prasad,Chattopadhyay, Surajit
, p. 410 - 415 (2018/11/01)
The new azo ligand 2-(2-(p-tolyldiazenyl)phenylamino)acetic acid, H2L, [formulated as H3CC6H4-N = N-C6H4-N(H)(CH2COOH)] was prepared. Reaction of H2L with Na2PdCl4 afforded the orthopalladated mononuclear [(HL)PdCl] complexes. The uncoordinated free dangling carboxylic acid function was recognized and confirmed by X-ray crystallographic studies. The [(HL)PdCl] complex was immobilized on Merrifield resin tethering with the free carboxylic acid function of the complex. Catalytic activity of orthpalladated [(HL)PdCl] complex in homogeneous media and Merrifield supported immobilized complex in heterogeneous phase, toward Suzuki cross-coupling reactions, were examined.
