42175-12-2Relevant articles and documents
Palladium nanoparticles encapsulated in polyimide nanofibers: An efficient and recyclable catalyst for coupling reaction
Du, Yijun,Gou, Faliang,Gao, Danning,Liu, Zhifeng,Shao, Linjun,Qi, Chenze
, (2021/09/15)
In this study, palladium-encapsulated poly(amic acid) (Pd@PAA) nanofibers were prepared by electrospinning, followed by thermal imidization to synthesize palladium-encapsulated polyimide (Pd@PI) nanofibers. Scanning electron microscopy (SEM) images confirmed the preparation of uniform and smooth Pd@PAA and Pd@PI nanofibers. Thermogravimetric analysis (TGA) results reveal that the Pd@PI nanofibers possessed excellent thermal stability. The dispersion of palladium nanoparticles in the polyimide nanofibers was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The catalysis results show that this Pd@PI fibrous catalyst was very efficient to catalyze the cross-coupling reactions of aromatic iodides with n-butyl acrylate (Heck reaction) or phenylboronic acid derivatives (Suzuki reaction) to afford the desired products in good to excellent yields. Moreover, the Pd@PI catalyst could be easily separated and recovered from the reaction mixture by simple filtration due to the regular fibrous structure and reused for 10 times for both Heck and Suzuki reactions without obvious loss of its initial catalytic activity. Thus, the Pd@PI nanofiber catalyst holds great potential in chemical industry in terms of its excellent catalytic activity and stability.
Pd–ninhydrin immobilized on magnetic nanoparticles: synthesis, characterization, and application as a highly efficient and recoverable catalyst for Suzuki–Miyaura and Heck–Mizoroki C–C coupling reactions
Hajjami, Maryam,Shirvandi, Zeinab
, p. 1059 - 1072 (2020/01/06)
Abstract: In this work by controlling the interaction between the inorganic complexes and the support material, we have designed a high-activity nanostructured combined of magnetic nanoparticles and Pd–ninhydrin-terminated complex as catalyst. The as-prepared catalyst was characterized by FT-IR, XRD, VSM, SEM, EDAX, ICP, and TGA techniques. This magnetic nanostructure can be used as a novel, green, and efficient heterogeneous catalyst for Suzuki–Miyaura and Heck–Mizoroki C–C coupling reactions. This catalyst showed promising catalytic activity and excellent yields toward various aryliodides and arylbromides in mild reaction conditions. In Suzuki–Miyaura reactions, various aryl halides (I, Br) were coupled with phenyl boronic acids in 5?mg of catalyst and 8?mg of catalyst used for Mizoroki–Heck reaction of aryl halides (I, Br) with n-butyl acrylate or acrylonitrile. The catalyst was reusable and recycled six times without a significant loss in activity and leaching of palladium. Graphic abstract: [Figure not available: see fulltext.].
Biogenic synthesis of palladium nanoparticles using Boswellia sarrata and their applications in cross-coupling reactions
Arde, Satyanarayan M.,Rashinkar, Gajanan S.,Jadhav, Sanjay N.,Patil, Audumbar D.,Salunkhe, Rajashri S.
, (2020/10/02)
A facile and green route for biogenic synthesis of palladium nanoparticles (PdNPs) using aqueous extract of nontoxic and renewable Boswellia sarrata leaves is reported. The as-synthesized PdNPs were systematically characterized by using ultraviolet (UV)–visible spectroscopy, X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The PdNPs were crystalline and cubic in nature with average particle size of ~6 nm and successfully employed as heterogeneous catalyst in the Suzuki–Miyaura and Mizoroki–Heck cross-coupling reactions. The PdNPs could be recycled up to five times with modest change in the catalytic activity.
