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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Chemical Society
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Journal DOI :
Korean Chemical Society
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Volume & Issues
Volume 32, Issue 6 - Dec 1988
Volume 32, Issue 5 - Oct 1988
Volume 32, Issue 4 - Aug 1988
Volume 32, Issue 3 - Jun 1988
Volume 32, Issue 2 - Apr 1988
Volume 32, Issue 1 - Feb 1988
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Solvation in Mixed Solvents (VII). Solvolysis of t-Butyl Halide in Isodielectric Solvents
Lee, Ick-Choon ; Lee, Hai-Whang ; Uhm, Tae-Seop ; Sung, Dae-Dong ; Ryu, Zoon-Ha ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 85~93
Solvolyses of t-butylhalides (X = Cl, Br, I) in quasi isodielectric solvent system, MeOH-nitromethane, MeOH-nitrobenzene and MeOH-ethyleneglycol have been studied kinetically. Methanolyses for t-butylhalides in MeOH-NM and MeOH-NB show rate maxima at 40~100 % (v/v) MeOH. The rate maxima observed have been interpreted as a result of cooperative enhancement of polarity-polarizability and hydrogen bonddonor ability of solvents. The influences of polarity-polarizability and hydrogen bonddonor ability on reactivities of substrates have been discussed in terms of Y value changes. The solvolysis rates for t-butylhalides in E.G. are more than 20 fold faster than those in MeOH and this was attributed to the solvent structure of E.G.
A Unique Function of Reaction Path (I). Definition and Approximation
Kim, Ho-Jing ; Jang, Hyo-Weon ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 94~102
A quantitative description of the principle of least motion is suggested. The reaction path function of electronic variables, its norm and the reaction path average energy, which are unique for a given reaction path on a potential energy surface of a reacting system, are defined and their characteristics are discussed. It is postulated that the norm of the function and the average energy can be used as a criterion for identification of the preferred path of a unimolecular isomerization reaction. For a molecule with a certain symmetry, the preferred path, with which Woodward-Hoffmann rule agrees, is immediately identified without laborious computation.
A Unique Function of Reaction Path (II). Applications to Thermal Electrocyclic Reactions
Kim, Ho-Jing ; Jang, Hyo-Weon ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 103~112
For two possible paths of thermal ring opening reactions, the approximate reaction path functions, their norms and the approximate reaction path average energies are computed and compared. Illustrated examples clearly justify the postulate that the path with larger norm and lower average energy has lower barrier height than the other.
Reversed-Phase Ion-Interaction Chromatography of Aromatic Sulfonic and Carboxylic Acids
Kang Sam-Woo ; Oh Hae-Beom ; Lee Seung-Seok ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 113~121
The retention mechanism and separation of various aromatic sulfonic and carboxylic acids on reversed-phase liquid chromatographic column were studied in the mobile phase containing dodecyltrimethylammonium bromide (DTAB). The retention mechanism was found to be followed the ion-interaction model where the DTAB occupies a primary layer at the stationary phase while the sample anions and other co-anions in the system compete for forming the secondary layer. The capacity factors of samples were influenced by the several factors such as pH, concentration of various organic solvents, co-anions in the mobile phase and functional groups in sample molecules. Some mixtures of organic samples were attempted to separate under optimum condition.
Kinetic Studies on the Aquation of Tetrahedral Copper (II) and Cobalt (II) Complexes
Kim, Young-Inn ; Choi, Sung-Nak ; Kim, Jung-Sook ; Kim, Hae-Kyung ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 122~129
The rates of aquation of sparteine cobalt(II) halide and sparteine copper(II) halide were investigated in the citrate buffer solutions. The aquation of cobalt(II) complexes proceeds via D-mechanism and the catalytic effect of halide ions is not observed. The aquation of copper(II) complexes proceeds via
-mechanism and is catalyzed by the presence of cyanide and halide ions, and the aquation rate is pH dependent. The different mechanistic behavior of cobalt(II) complexes from corresponding copper(II) complexes seems to be attributed to the weakness of Co-N bond in the coordination sphere.
Increased Sensitivity in Cyanide Measurement by Differential-Pulse Cathodic Stripping Voltammetry
Na, Moon-Son ; Kwon, Young-Soon ; Czae, Myung-Zoon ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 130~134
Direct differential-pulse cathodic stripping voltammetry on mercury electrode (HMDE) provides a sensitive technique for low level cyanide measurement in distilled and sulfide free solution. Cyclic voltammetry revealed the forming and redissolution reactions were reversible at pH 7 in 0.1M KCl-0.01M phosphate supporting electrolyte. The analytical conditions have been optimized. With deposition time of 3 min at deposition potential 0.00V(vs. Ag/AgCl) in this medium of pH7, quite reproducible and linear calibration curve was obtained down to
which was the detection limit.
A Study of the Retention Mechanism of the Monosubstituted Benzenes in Reversed-phase Liquid Chromatography (II)
Lee, Dai-Woon ; Choi, Yong-Wook ; Lee, Won ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 135~143
The correlations between chromatographic parameters of monosubstituted benzenes and several physical parameters in reversed phase liquid chromatography were studied. The relationships between retention data and polarity index were investigated by plotting
which were relative retention and relative polarity index of monosubstituted benzenes with respect to benzene, respectively. The linear relationship between relative retention and polarity index was observed for the monosubstituted benzenes having polar group, while in case of those having nonpolar group, the good linearity was observed by combination with relative molecular weight i.e.
. Multivariant regression analysis,
+c did not give significantly better correlations compared to single variant analysis,
+c, but multiple stepwise regression analysis was recommended when several physical parameters simultaneously were chosen. The best correlation between retention data for monosubstituted benzenes taken from the literature and substituent constant(
), derived from hydrophobic parameter and the first order molecular connectivity index
, was established for methanol/water mobile phase system. The larger the surface coverage of the stationary phase, the higher was the correlation coefficient between these two parameters and retention data.
New Synthetic Route to 1, 4-Dihydropyridine Monoacid Derivatives
Shim, Young-Key ; Lee, Sang-Hee ; Kang, Jae-Sung ; Kim, Wan-Joo ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 144~148
A novel synthetic route to 1,4-dihydropyridine mono carboxylic acid derivatives is described. Allyl methyl 2,6-dimethyl-4-(3'-nitrophenyl)-1,4-dihydropyridine-3, 5-dicarboxylate (IV) was treated with
in dioxane for 30 min at 110
with reflux to give the mono acid compound(V) in 94% yield. The mono acid intermediate was converted to 2-(N-benzyl-N-methylamino)ethyl methyl 2,6-dimethyl-4-(3'-nitrophenyl)-1,4-dihydropyridine-3, 5-dicarboxylate (VII) (Nicardipine) and their derivatives in 70~85% yield.
Synthesis of Pentasil Zeolites
Ahn, Byung-Joon ; Chon, Hak-Ze ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 149~155
Pentasil zeolites, including ZSM-5, ZSM-8, ZSM-11 and silicalites, were synthesized using various organic cations. Synthesis run was carried out in a Parr pressure reactor of
capacity and a self-constructed reactor with a magnetic stirring system. The reactant materials used are colloidal silica (Snowtex), sodium aluminate, sodium chloride, TEA, TPA, TBA, Choline and water. The composition of starting materials and the reaction temperature were found to be important factors for the synthesis of uniform pentasil zeolites.
Selective Reduction of Methyl-2-Azidocinnamates Using Potassium Tetracarbonylhydridoferrate
Shim, Sang-Chul ; Yeo, Young-Kuk ; Choi, Kui-Nam ; Lee, Hak-Ki ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 156~158
-Unsaturated Cyclohexenecarboxamide with LDA
Kim, Ki-Yup ; Lee, Kyung-Woong ; Jun, Young-Moo ;
Journal of the Korean Chemical Society, volume 32, issue 2, 1988, Pages 159~160