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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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Kinetics of the Reaction of Benzyl Chlorides with Pyridine in DMF under High Pressure
Kee Joon Choi ; Young Hoon Lee ; Jin Burm Kyong ; Jeong Rim Kim ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 291~296
Rates of the reaction for p-nitrobenzyl chloride, benzyl chloride and p-methylbenzyl chloride with pyridine in DMF solvent have been measured by an electric conductivity method at
under various pressures. From those rate constants, the activation parameters
) were evaluated.
are both negative valued, but
is positive and
is large negative value. From the evaluation of the initial state and transition state which was resulted from substituents and pressure, it was found that this reaction proceeds through bimolecular reaction.
The Crystal and Molecular Structure of Ammonium p-Methylbenzenesulfonate
Choong Tai Ahn ; Gene B. Carpenter ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 297~300
, Mr = 189.23, orthorhombic, space group
, a = 20.406(4), b = 6.271(1), c = 7.067(2)
, V = 904.19
, Z = 4,
= 0. 71069
, T = 298K, F(000) = 400, final R = 0.057 for 994 unique observed reflections with I >
. The methylbenzene portion including the sulfur atom is nearly planar. Between the
groups and the ammonium ion, there are three unique hydrogen bonds; two of which make the anions linked along the c-axis and the remaining one along the b-axis. These hydrogen bonds make two-dimensionally hydrogen-bonded molecular layers. Among these hydrophilic layers, the methylbenzene moieties cluster together to form hydrophobic layers.
Kinetics for Mononuclear Heterocyclic Rearrangement of N-(5-phenyl-1,2,4-oxadiazol-3-yl)-N'-arylformamidine (I)
Jung Ui Hwang ; Jong Jae Chung ; Young Zoo Youn ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 301~310
Reaction rates for mononuclear heterocyclic rearrangement of N-(5-phenyl-1,2,4-oxadiazol-3-yl)-N'-arylformamidines into 3-acylamino-1-aryl-1,2,4-triazoles were determined spectrophotometrically in dioxane/water (50 : 50, v/v). There are two different reaction paths according to pH. One is pH-independent path, the other is pH-dependent one. In pH-independent path, the result of substituent effect by IYT equation show that N-H bond breaking as well as new N-N bond formation controls the reaction rate. In pH-dependent path, concave-upward Hammett plot was observed. It can be concluded that new N-N bond formation is more advanced than N-H bond breaking in transition state for electron-donating substituents, but N-H bond breaking is more advanced than new N-N bond formation for electron-withdrawing substituents.
Solubilities of Naphthalene in Supercritical Fluids
Jeong-Rim Kim ; Ho-Kun Kim ; Jin-Burm Kyong ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 311~317
The solubilities of naphthalene in ammonia could be measured at various temperatures and pressures above the critical point of ammonia to represent the relationship between the solubility and the density of ammonia at desired temperature and pressure by means of a simple equation. This equation allows a calculation of the solubilities at higher and lower pressures. Using the equation, the solution energies, the solution entropies, and the second cross virial coefficients between naphthalene and ammonia have been determined to be compared with those in the case of the dissolution of naphthalene in supercritical carbon dioxide.
Pressure Dependence on the Aquation of s-cis-[Co(ee)
]+ and s-cis-[Co(eee)
Jong-Jae Chung ; Sung-Oh Bek ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 318~322
We studied the aquation reaction of s-cis-
complex ions under the various temperatures and pressures. In these complexes eee is
. The rate law of the aquation reactions of these two complexes obeys
[CO(III)], where rate constants of s-cis-
in condition of 0.1M
. In the same condition, the activation entropies of s-cis-[Co(eee)
]+ and s-cis-(Co(eee)
]+ complexes respectively are -15.5 eu and -7.54eu, and the activation volumes are
. From these data, we could infer the mechanism of the aquation reaction as the interchange dissociation (Id) mechanism.
Preparation of the Proteus vulgaris Bacterial Electrodes for the Determination of Urea and Their Application
Gwon-Shik Ihn ; Bong-Weon Kim ; Sohn Moo-Jeong ; Ihn-Tak Kim ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 323~332
The bacteria containing urease convert each molecule of urea into two molecules of ammonia and one molecule of carbon dioxide gas. Bacterial electrodes have been constructed by immobilizing the Proteus vulgaris on an ammonia and a carbon dioxide gas-sensors, and were investigated for the effects of pH, temperature, buffer solution, bacterial amounts and interferences, and life time. NH3-bacterial electrode based on ammonia gas-sensor had linearity in the range of
M urea in pH 7.4, 0.05M phosphate buffer at
with a slope of 116.7 mV/decade. While
bacterial electrode based on carbon dioxide gas-sensor bad linearity in the range of
M urea in pH 7.0, 0.1M phosphate buffer at
with a slope of
. As the clinical application, urea in urine was determined by these devices and this result was compared with spectrophotometric method. Consequently, these electrodes could be used for the analysis of many samples because of simplicity, rapidity and convenience of the experimental procedure.
Preparation and Comparison of Proteus mirabilis and Citrobacter freundii Bacterial Electrodes for the Determination of Cytosine
Gwon Shik Ihn ; Bong Weon Kim ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 333~341
The bio-electrode for cytosine has been constructed by immobilizing Proteus mirabilis and Citrobacter freundii on an ammonia gas-sensor. Bacteria containing cytosine deaminase convert one molecule of cytosine into one molecule of ammonia. The Proteus mirabilis bacterial electrode showed linear response to cytosine concentration in the
M with a slope of 45-48 mV/decade in 0.2 M phospbate buffer solution at pH 8.4. The Citrobacter freundii bacterial electrode showed linear response to cytosine concentration in the
M with a slope of 48 mV/decade in 0.05M phosphate buffer solution at pH 7.6. These electrode were investigated for the effects of pH, temperature, buffer solutions, amounts of bacteria, interferences, inorganic salts and lifetime.
Kinetics and Mechanism for Aquation of
Byung-Kak Park ; Joo-Sang Lim ; Sung Nak-Jung ; Il-Bong Lee ; Kwang-Jin Kim ; Sung-Gu Kang ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 342~350
An experimental investigation is made to determine the mechanism of the aquation of
aqueous solution. The progress of reaction is followed UV/vis-spectrophotometrically by a measurment of the absorbance at a specific wavelength of Co(III) complex as a function of time. The aquation of cis-
has been found to be first order and second order with respect to the concentration of
catalyst, respectively. It has been found that the reaction rate for aquation of the trans-form is faster than that of cis-form, and that the product of either cis-form or trans-form is always in the mixture ratio of 97 % to 3 %. Plausible reaction mechanism is proposed for the reaction system on the basis of kinetic data and activation parameters. Theoretical rate equation derived from the proposed mechanism is consistent with the observed one.
Electrochemical Study of Uranium(VI) in Propanediol-1,2-Carbonate
Chong Min Pak ; Young Lae Kim ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 351~357
The electrochemical reduction of uranyl ion at the dropping mercury electrode and/or mercury microelectrode has been studied in propanediol-1,2-carbonate (PDC) by voltammetric techniques. The position of peak potentials, the nature of limiting currents, their dependency on temperature and on concentrations, reversibility of electrode reactions, and influence of addition of phenol are described. The influence of PDC in aqueous solution of uranyl ion was also described. The values of kinetic parameters, viz., transfer coefficient, formal constant for the electrode reactions bave been determined by Koutecky's method as extended by Meites and Israel. The values of
have also been calculated.
Studies on the New Analytical Methods for Separation and Recovery of Rare Earth Metals (I) : Adsorption Characteristics of U(VI) Ion by New Synthetic Resins with Macrocyclic Compounds
Jung Oh Jin ; Hak Jin Jung ; Joon Tea Kim ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 358~370
Several new ion exchange resins have been synthesized from chloromethyl styrene-1,4-divinylbenzene(DVB) with 1%, 2%, 4%, and 10%-crosslinking and macrocyclic ligands of cryptand type by interpolymerization method. The adsorption characteristics and the pH, time, solvents and concentration dependence of the adsorption of metal ions by this resin were studied. The correlation between the separation characteristics of uranium, rare earths and transition metal on the resins and the stability constants of complexes with macrocyclic ligands have been examined. The resins were very stable in both acidic and basic media and have good resistance to heat at
aqueous solution are not adsorbed on the resins below pH 3.0, but the power of adsorption of
increased rapidly above pH 4.0. The optimum equilibrium time for adsorption of metallic ions was twenty minutes and adsorptive power decreased in proportion to crosslinking size of the resins and order of dielectric constants of solvents used and the selective sequence for metal cations is in the order of
Synthesis of the New Thebaine Derivatives by the Diels-Alder Reaction with Northebaine
Kunjea Kim ; Kyekwang Kim ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 371~376
Thebaine was reacted with diisopropyl azodicarboxylate to give northebaine. Diels-Alder reaction between the compound and nitrosobenzene was attempted. The hydrogen of the adducted northebaine was substituted with chloroacetyl chloride and succinic anhydride. We have synthesized the new thebaine derivatives with phenylhydroxylamine at 14-carbon and also acetyl or succinyl at 17-nitrogen with yields of 22% and 16%.
Subunits and Composition of Carotenoprotein from Salmo Salar Eggs
Jae-Woong Kim ; Tae-Jin Min ; Tae-Young Lee ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 377~384
Carotenoprotein from Salmo Salar eggs was purified and characterized by CM-cellulose, 50%
, DEAE-cellulose and sephadex G-75 column. The chromoprotein had a spectrum with
409, 540 and 580nm in p-buffer (pH 7.0) at initial step. Molecular weights by sephadex G-200 gel filtration were 50, 200 and 26,000 daltons. SDS-PAGE analysis showed a structure with four identical subunits (12,500 daltons). Its sample retained a small amount of carbohydrates and lipids. Amino acids were analyzed, and mannose, galactose and glucosamine also were identified. Carotenoid extacted with acetone was found to be astaxanthin ester by partition test, epoxy test, iodine test, allylic test, reduction, acetylation, uv/vis, ir and nmr datas. Stearate (47.9%) and palmitate (21.4%) were predominant fatty acids in the astaxanthin ester.
1,2,4-Triazine Ⅰ ; Tautomerism in Substituted 6-Oxo-1,6-dihydro-1,2,4-triazines
Jae-Keun Lee ; Moo-Duk Park ; Dong-Yeob Lee ; Woo-Sik Kim ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 385~389
Synthesis of 6-oxo-1,6-dihydro-1,2,4-triazine derivatives was tried. The model compounds of the possible tautomers were synthesized. The tautomeric equilibrium of 6-oxo-1,6, dihydro-1,2,4-triazine derivatives was determined by comparing their UV spectra and those of model compounds. 6-oxo-tautomer was exclusively detected in water and alcohol solutions without observation of the expected 6-hydroxy tautomers.
Isomer Formation in the Chlorination of Highmolecular Paraffinic Hydrocarbons by Various Halogenating Agents
Li-Hoan Kung ;
Journal of the Korean Chemical Society, volume 32, issue 4, 1988, Pages 390~405
The chlorination of
with N-Chlorosuccinimide, tert-BuOCl,
which both form loose complexes with
atoms yielded mixtures of isomeric monochloroalkanes which were analyzed quantitatively. An isomer ratio differing from that known for the substitution of paraffinic hydrocarbons was observed. The isomer distribution observed is the result of the combined effects of the differing C-H dissociation energies of the different types of H atoms of the alkane and of the free energy of the attacking radical with polar effects of the attacking radical as well as of the hydrocarbon.