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장원길,Jihye Shin,Yunghee Oh,Byoung Joon Ahn 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.4
In this paper our recent results of the Suzuki reaction using [Pd(NH3)4]2+-modified nanopore silica under solvent-free conditions are described. [Pd(NH3)4]2+-modified nanopore silica was prepared by impregnation using an aqueous solution of [Pd(NH3)4]Cl2 in water or in acetonitrile. The BET surface area, BJH mean pore diameter and pore volume are 138.8 m2/g, 8.7 nm, and 0.34 cm3/g, respectively, and the pore size distribution shows a single peak at around 5 nm in diameter. It has been shown that the Suzuki reaction is performed in excellent yield by using Pd-modified nanopore silica under solvent-free conditions heated at 90–100 8C for 3–5 h. It has been found that aryl bromides can be coupled with aryl boronic acids in excellent yield under solvent-free condition. Phenyl iodide was also coupled with phenyl boronic acids in excellent yield, whereas phenyl chloride gave product in poor yield. And KF, CsF or Bu4NF were also found to be a convenient base additive.
장원길,안병준,GeumHee Chae,So Ra Jang,Jihye Shin 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
Palladium catalysts, Pd/MCM-41 and Pd/SBA-15 were prepared by impregnation of an aqueous solution of [Pd(NH3)4]Cl2 on MCM-41 and SBA-15. Palladium contents of Pd/MCM-41 and Pd/SBA-15 are 8.4% and 8.7%, respectively. It has been shown that these catalysts are very suitable to microwave-assisted Suzuki reactions under solvent-free condition. It is also found that the base additives for this reaction are K2CO3,Cs2CO3 or CsF. Thus, phenylboronic acid and phenyl iodide with Pd/MCM-41 produce biphenyl by microwave irradiation for 10 min in 97.4% yield. Phenyl bromide, instead of phenyl iodide, also proceeds the reaction with phenylboronic acid using Pd/MCM-41 or Pd/SBA-15 yielding biphenyl by microwave irradiation for 10 min in excellent yield. Whereas the reaction of phenyl chloride with phenylboronic acid gives poor yield in same condition. Various aryl iodides and aryl bromides are tested. In this paper our recent results of microwave-assisted Suzuki reaction using Pd/MCM-41 and Pd/SBA-15 under solventfree condition are described.
장원길,안병준,채금희,장소라,신지혜 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
In this paper microwave-assisted Sonogashira reactions of phenyl acetylene with aryl iodide using palladium modified Pd-MCM-41, Pd-Y, Pd-VSB-5 and Pd-SBA-15 under solvent-free conditions were described. The results of microwave-assisted Sonogashira reaction using Pd-MCM-41 or Pd-Y in aqueous conditions were also discussed. The microwave-assisted reaction of phenyl acetylene with phenyl iodide using Pd-Y or Pd-MCM-41 and DBU as a base under solvent-free conditions resulted in yields of 85% and 93%, respectively. The reaction with Pd-Y or Pd-MCM-41 using DBU in DMF:H2O (4:1) solution reduced yields to 64% and 76%, respectively.
Syntheses of Some Thiol Derivatives for Organic Monolayer
Chang, Wonghil 전주대학교 자연과학종합연구소 1997 전주대학교 자연과학연구소 학술논문집 Vol.10 No.2
The research of self-assembled monolayers offers unique opportunities to investigate the fundamental understanding of self-organization, structure-properties-relationships, and interfacial phenomena. The modification of both head and tail groups of the constituent molecules for self-assembled monolayers would be a suitable tool for an understanding of competition among intermolecular, molecule-substrates, and molecule-solvent interactions. In order to find the methods for the construction of dendrimer containing organic thin layers, the thiols bearing the phenol type functionality on the other side was prepared.
Synthesis of Some Bis(bipyridyl) Ligands Linked to Phenyl Groups
Chang, Wonghil,Park, Sunkyeong,Jeon, Il Cheol 전주대학교 자연과학종합연구소 1997 전주대학교 자연과학연구소 학술논문집 Vol.10 No.2
In order to investigate the utilization of photochemically and electrochemically active metal-bipyridyl complexes bridged with xylene group, some bis(bipyridyl)ligands are prepared. The ligand, o-bis(4'-methyl-(2,2'-bipyridyl))-4-ethyl)benzene (oxdbp), was synthesized from the reaction of the anion of 4,4'-dimethyl-2,2'-bipyridyl with o-α,α'-dibromoxylene. m-Derivative (mxdbp) and p-derivative (pxdbp) were also synthesized from m-α,α'dibromoxylene and p-α, α'-dibromoxylene, respectively.
Radical Reactions of α-(ω'-Bromoalkanoyl)cycloketones
Chang, Wonghil,Shin, Jihye 전주대학교 자연과학종합연구소 1997 전주대학교 자연과학연구소 학술논문집 Vol.10 No.2
In order to develop the method with ω-bromoalkanoyl chloride. These radical precursors were treated with several radical reaction for construction of carbon skeleton of medium and large membered ring natural products, new radical ring expansion reaction was performed. For this study, various 1,3-diketone bearing ω-bromoalkyl chain was prepared from the corresponding ketone by acylation conditions. The results of this study were described.