156871-47-5Relevant academic research and scientific papers
Synthesis of Water-Dispersible Pd Nanoparticles Using a Novel Oxacalixarene Derivative and their Catalytic Application in C–C Coupling Reactions
Mehta, Viren,Panchal, Manthan,Kongor, Anita,Panchal, Urvi,Jain
, p. 1581 - 1590 (2016)
A novel 5,17-di(hydrazinecarbonyl) tetranitrooxacalix[4]arene (DHOC) derivative has been synthesized and characterized using various spectroscopic techniques. This DHOC derivative has been used to produce water-dispersible catalytically active Pd nanoparticles (PdNps). In the nanoparticle synthesis, DHOC serves as both a reducing and a stabilizing agent, thus simplifying the preparation of the PdNps because no separate reagents are required to reduce and stabilize the nanoparticles. These PdNps were characterized by a number of techniques such as Transmission Electron Microscopy and UV–Visible spectroscopy. The water-dispersible PdNps were 5?±?2?nm in size and showed high catalytic activity in numerous C–C coupling reactions such as the Sonogashira, Suzuki-Miyuara and Heck reactions. Graphical Abstract: [Figure not available: see fulltext.]
Controlled synthesis of uniform palladium nanoparticles on novel micro-porous carbon as a recyclable heterogeneous catalyst for the Heck reaction
Song, Kunpeng,Liu, Peng,Wang, Jingyu,Pang, Lei,Chen, Jian,Hussain, Irshad,Tan, Bien,Li, Tao
, p. 13906 - 13913 (2015/08/18)
Novel dual-porous carbon-supported palladium nanoparticle (Pd NP) catalysts were prepared by sequential carbonization and reduction of microporous organic polymer-encaged PdCl2. The diverse pore structure of microporous organic polymers provides a reservoir for the palladium precursors and prevents Pd NPs from sintering during the carbonization and reaction. The microporous structure has a significant effect on the size and dispersion of palladium NPs. The average size of the Pd NPs (in the range of 4-6 nm) was tuned by changing the pore size distribution and the carbonization temperature. The resulting carbon-supported Pd NPs were characterized by TEM, BET, XRD, and XPS and the Pd loading was calculated by AAS. The encaged Pd NP catalysts prepared by this methodology exhibited outstanding stability and reusability in the Heck reaction and could be reused at least 10 times without appreciable loss of activity.
Palladium polyether diphosphinite complex anchored in polyethylene glycol as an efficient homogeneous recyclable catalyst for the Heck reactions
Sawant, Dinesh,Wagh, Yogesh,Bhatte, Kushal,Panda, Anil,Bhanage, Bhalchandra
experimental part, p. 2390 - 2393 (2011/05/09)
Palladium polyether diphosphinite complex anchored on polyethylene glycol is reported as an efficient catalyst for Heck coupling reactions. The catalyst is soluble in the solvent with reactants and products during reaction and can be separated from reaction media in biphasic form by the addition of anti-solvent like n-hexane and further recycled. The developed methodology offers mild reaction condition, short reaction time with an excellent recyclability of the catalyst. Aryl iodides as well as aryl bromides are well tolerated giving excellent yields.
In situ synthesis of a Pd-poly (1,8-diaminonaphthalene) nanocomposite: An efficient catalyst for Heck reactions under phosphine-free conditions
Islam, Rafique U.,Witcomb, Michael J.,Scurrell, Michael S.,Van Otterlo, Willem,Mallick, Kaushik
experimental part, p. 116 - 121 (2010/12/25)
Polymerization of 1,8-diaminonaphthalene was performed using palladium acetate as an oxidizing agent. During the oxidative polymerization process the electrons liberated reduced the palladium (II) ions with the formation Pd nanoparticles, these colloidal particles being stabilized within the poly (1,8-diaminonaphthalene) matrix. Electron microscope images revealed that the palladium particles were well dispersed in the polymer matrix and had an average diameter of 2.5 nm. The metal-polymer composite material was initially tested for the coupling of iodobenzene with alkene (methyl acrylate) in the presence of a base. The yield of the substituted alkene derivative was found to be excellent. A series of iodo- and bromobenzene derivatives were tested for the coupling reaction with different alkenes. A coupled product was produced with high TOF values proving the efficiency of the composite material as an efficient catalyst for the Heck reaction under phosphine-free conditions.
Synthesis and calcium antagonistic activity of diethyl styrylbenzylphosphonates
Younes, S.,Tchani, G.,Baziard-Mouysset, G.,Stigliani, J. L.,Payard, M.,et al.
, p. 87 - 94 (2007/10/02)
Twenty-three new phosphonic ester derivatives of stilbene exhibiting structural analogies with fostedil are described.Examination of calcium antagonism showed that this activity could not be increased by introducing electron-withdrawing, electronreleasing
