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Cheong, Minserk,Lee, Kang Bo 慶熙大學校 1997 論文集 Vol.26 No.-
로듐-요오드 촉매계를 이용하여 무수 아세트산과 아세트산을 하나의 반응기 내에서 동시에 합성할 수 있었다. 오르토포름산 트리메틸의 존재 하에서 포름산 메틸은 지금까지 알려진 두 단계 반응을 거치지 않고 간단하게 무수 아세트산으로 변환되었다.
Polymer-supported Zinc Tetrahalide Catalysts for the Coupling Reactionsof CO2 and Epoxides
이보라,Nan Hee Ko,안병성,Minserk Cheong,Hoon Sik Kim*,이제승 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.11
Homogeneous zinc tetrahalide complexes, highly active catalysts for the coupling reactions of alkylene oxide and CO2 produce alkylene carbonates, were heterogenized due to their tendency to decompose produced alkylene carbonates during the distillation process. Heterogenization of homogeneous zinc tetrahalide complexes was achieved by polymerizing 1-alkyl-3-vinylimidazolium zinc tetrahalides. These polymerized zinc tetrahalide catalysts displayed similar activities to their corresponding monomeric analogues for the coupling reactions of carbon dioxide with ethylene oxide (EO) or propylene oxide (PO) to produce ethylene carbonate (EC) or propylene carbonate (PC). TGA studies showed that the polymer-supported zinc tetrahalide catalysts are thermally stable up to 320 oC. The catalyst recycle test showed that the supported catalysts could be reused over six times. After removal of the polymer-supported catalyst through a simple filtration, EC was able to be isolated without decomposition.
Absorption and desorption of SO<sub>2</sub> in aqueous solutions of diamine-based molten salts
Lim, Seung Rok,Hwang, Junhyeok,Kim, Chang Soo,Park, Ho Seok,Cheong, Minserk,Kim, Hoon Sik,Lee, Hyunjoo Elsevier 2015 Journal of hazardous materials Vol.289 No.-
<P><B>Abstract</B></P> <P>SO<SUB>2</SUB> absorption and desorption behaviors were investigated in aqueous solutions of diamine-derived molten salts with a tertiary amine group on the cation and a chloride anion, including butyl-(2-dimethylaminoethyl)-dimethylammonium chloride ([BTMEDA]Cl, p<I>K</I> <SUB>b</SUB> =8.2), 1-butyl-1,4-dimethylpiperazinium chloride ([BDMP]Cl, p<I>K</I> <SUB>b</SUB> =9.8), and 1-butyl-4-aza-1-azoniabicyclo[2,2,2]octane chloride ([BDABCO]Cl, p<I>K</I> <SUB>b</SUB> =11.1). The SO<SUB>2</SUB> absorption and desorption performance of the molten salt were greatly affected by the basicity of the molten salt. Spectroscopic, X-ray crystallographic, and computational results for the interactions of SO<SUB>2</SUB> with molten salts suggest that two types of SO<SUB>2</SUB>-containg species could be generated depending on the basicity of the unquaternized amino group: a dicationic species comprising two different anions, HSO<SUB>3</SUB> <SUP>−</SUP> and Cl<SUP>−</SUP>, and a monocationic species bearing Cl<SUP>−</SUP> interacting with neutral H<SUB>2</SUB>SO<SUB>3</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Diamine-based molten salts having two different basic sites were synthesized. </LI> <LI> Weakly basic molten salts reversibly interact with SO<SUB>2</SUB> in aqueous media. </LI> <LI> The SO<SUB>2</SUB> absorption mode was greatly affected by the basicity of molten salts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Promoting Effect of AlCl3 on the Fe-catalyzed Dimerization of Bicyclo[2.2.1]hepta-2,5-diene
Hoon Sik Kim,Ho-Jung Kang,Ly Vinh Nguyen,이제승,Minserk Cheong,Mai Dao Nguyen,Jeong Sik Han,Byung Hun Jeong 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.7
The activity of the catalytic system composed of Fe(acetylacetonate)3 (Fe(acac)3), triphenylphosphine, and diethylaluminum chloride for the dimerization of bicyclo[2.2.1]hepta-2,5-diene (2,5-norbornadiene, NBD) to produce hexacyclic endo-endo dimer (hexacyclo[7.2.1.02,8.13,7.15,13.04,6]tetradec-10-ene, Hnn) was significantly enhanced by the presence of AlCl3, especially at the molar ratios of NBD/Fe(acac)3 of 500. XPS analysis of the catalytic systems clearly demonstrates that AlCl3 facilitates the reduction of Fe(acac)3 to form active species, Fe(II) and Fe(0) species. The layer separation was observed when [BMIm]Cl was used along with AlCl3, but catalyst recycle was not very successful.
Role of Alkyl Group in the Aromatic Extraction Using Pyridinium-Based Ionic Liquids
Kim, Min Ji,Shin, Seung Hoon,Kim, Young Jin,Cheong, Minserk,Lee, Je Seung,Kim, Hoon Sik American Chemical Society 2013 The journal of physical chemistry. B, Condensed ma Vol.117 No.47
<P>The performance of <I>N</I>-alkylpyridinium-based ionic liquids with a SCN anion (PyILs) was evaluated for the selective extraction of aromatics from aliphatic hydrocarbons. The aromatic extraction ability of PyILs was greatly enhanced by the presence of a methyl group on the pyridinium ring at the 3- or 4-position, whereas the solubility of the aromatics in the PyILs decreased with increasing the number of methyl groups on the benzene ring. The FT-IR studies revealed that the solubility of an aromatic compound in a PyIL is closely correlated with the degree of aromatic C–H bending frequency shift observed during the dissolution of the aromatic compound in the PyIL: the larger the shift, the higher the solubility. The computational calculations on the dispersion interactions between aromatics and PyILs demonstrated that the anion–aromatic interaction is much more important than the cation–aromatic interaction in determining the aromatic solubility in PyILs, and such anion–aromatic interaction can be enhanced by introducing a methyl group at the carbon atom of the pyridinium ring.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpcbfk/2013/jpcbfk.2013.117.issue-47/jp409117j/production/images/medium/jp-2013-09117j_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp409117j'>ACS Electronic Supporting Info</A></P>