Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Bulletin of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Byeong Moon Kim
Volume & Issues
Volume 9, Issue 6 - Dec 1988
Volume 9, Issue 5 - Oct 1988
Volume 9, Issue 4 - Aug 1988
Volume 9, Issue 3 - Jun 1988
Volume 9, Issue 2 - Apr 1988
Volume 9, Issue 1 - Feb 1988
Selecting the target year
The Effects of Pressure, Temperature and Solvent Composition on Solvolysis of trans-[Co(N-eten)
in Water-t-butyl Alcohol Mixture
Park Yu Chul ; Cho Young Je ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 1~4
Rates of solvolysis of trans-[Co
have been investigated using spectrophotometric method at various pressures and temperatures in the mixtures of water with the t-butyl alcohol which possesses a high structure inducing capacity in water. The values of
obtained from pressure effect on the rate constants were 2.55∼ 5.83
. These values were discussed in terms of dissociative mechanism. Extrema found in the variation of
with solvent composition correlated with extrema in the variation of the physical properties of the mixtures. The logarithms of rate constants correlated linearly with both Grunwald-Winstein parameter and the reciprocal of dielectric constant (
). The gradient, m of Grunwald-Winstein plot for the trans-[Co
was 0.09, which is significantly lower than those for the other cobalt (Ⅲ)-dichloro complexes. It was suggested that the reaction is an Id mechanism with long extension of Co-Cl bond in the transition state, as found for the C-Cl bond in the transition state for the solvolysis of t-butyl chloride.
A Multivariate Analytical Study on the Water of Han-River and the Streams flowing into Han-River Basin
Lee Chul ; Kim Seungwon ; Kim Min-Young ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 5~9
Pattern recognition techniques have been applied for the extraction of some regularities of water samples under a wide variety of locations related to Han-River. For that purpose, an eigenvector analysis has been applied for defining each class so as to use the class as a training set for class analogy model of SIMCA. The models thus obtained have been used for the allocation of test samples between groups.
The Nature of the Intrinsic Barrier in Methyl Transfer Reactions
Lee Ikchoon ; Song Chang Hyun ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 10~12
The intrinsic barrier in the methyl transfer reaction
has been shown to vary quadratically with the C-X distance d; linear dependence of the intrinsic barrier on the deformation energies or methyl cation affinities of the substrate,
, should therefore hold only approximately in a narrow range of structural variations in X.
Halogenation of Resorcinol Derivatives
Baek Seung-Hwa ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 13~15
Several types of resocinols have been monobrominated in the ring in good yields with sodium bromide in the presence of 18-crown-6 on oxidation with m-chloroperbenzoic acid. Monoiodination takes place with 2'-(1-methylcyclohexen-3-yl)-5-(1,1-dimethylheptyl )-resocinol when sodium iodide is employed. This new reagent system, MX/18-crown-6/m-CPBA (M =
), effects the regiospecific halogenation of activated aromatic ring over olefinic double bond.
Purification of TiCl
by Adsorption Technique
Choi Q. Won ; Lee Kyung Ae ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 15~17
Titanium tetrachloride is purified using adsorption column packed with activated silica gel. When 120 ml of titanium tetrachloride was passed through an adsorption column filled with 7 g silica gel, iron content in titanium tetrachloride has been reduced from 7 ppm to less than 1 ppm, and aluminum from 46 ppm to 11 ppm, while silicon content being unchanged at about 60 ppm.
Mechanism for Chemiluminescent Reactions of Bis(2,4,6-trichlorophenyl)oxalate, Hydrogen Peroxide and Fluorescent Aromatic Hydrocarbons
Song Hyung-Soo ; Shin Hyung Seon ; Kim Kang-Jin ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 17~21
A mechanistic study on the chemiluminescence resulting from the reaction between bis(2,4,6-trichlorophenyl)oxalate(TCPO) and hydrogen peroxide in the presence of fluorescent polycyclic aromatic hydrocarbons in a viscous phthalate medium has been conducted. The rate determining step, decay rate constants, and relative quantum efficiencies yielded by varying the concentration of reagents generally support an existing mechanism. However, a reaction between TCPO and sodium salicylate was not observed.
Electrical Conductivity of the System ThO
Cho Seung Koo ; Park Sung Ho ; Kim Keu Hong ; Choi Jae Shi ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 21~24
The electrical conductivitv of the system
was measured in the temperature range 600-
atm. The mean value of activation energy was 1.45 eV. The observed conductivity dependence on
atm and was independent on oxygen partial pressure at
atm. It is suggested that these dependences are due to a mixed ionic plus electron hole conduction by Vo defect.
Synthsis of N-Phenylcysteine
Lee Ge Hyeong ; Park Chwang Siek ; Lee Hyo Won ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 25~27
N-Phenylcysteine (1) was prepared as a hydrobromide in good yield from the acid hydrolysis of 4-carboxy-2-methyl-3-phenyl-
-thiazolinium bromide (5), which was derived from the reaction of thioacetanilide and
-bromoacrylic acid. The treatment of ethyl ester(6) of N-phenylcysteine with 2,2-dimethoxypropane rendered it to ethyl 2,2-dimethyl-3-phenylthiazoline-4-carboxylate (7).
Surface-enhanced Raman Scattering(SERS) of Benzylcyanide in Silver Sol
Boo Doo Wan ; Kim Kwan ; Kim Myung Soo ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 27~29
The surface-enhanced Raman scattering(SERS) of benzylcyanide in a silver sol was investigated. It was concluded that the molecule adsorbed onto the silver surface via the
system of the CN group. The molecule was assumed to coordinate with either a single atom or two silver atoms. According to the SERS selection rule, the benzene ring of the adsorbed species seemed to assume a flat stance with respect to the silver surface.
Synthesis of Diaryl
-Diketones via Palladium Catalyzed Double Carbonylative Homo Coupling of Aryl Iodides with Carbon Monoxide
Kim Jin Il ; Kim Nam Jung ; Ryu Cheol Mo ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 30~32
were synthesized in moderately good yields through the palladium catalyzed reaction of aryl iodides with carbon monoxide. The reaction was tolerant of a wide variety of fuctionalities(
) on the aryl iodide. On the other hand, the similar reaction of aryl bromides or chlorides with carbon monoxide did not proceed.
XPS Studies of Oxygen Adsorption on Polycrystalline Nickel Surface (II)
Lee Soon-Bo ; Boo Jin-Hyo ; Ham Kyoung-Hee ; Ahn Woon-Sun ; Lee Kwang-Soon ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 32~36
The isotherms of oxygen chemisorption on polycrystaline nickel surface are obtained at various temperatures between 298K and 523K from intensity measurernent of O 1s xps peaks, and the activation energy of the chemisorption is estimated as a function of the coverage. The activation energy extrapolated to zero coverage is found to be -5.9 kJ/mol. The negative activation energy can be taken as a strong implication of the propriety of a currently accepted chemisorption model, in which molecularly adsorbed precursor state is assumed to exist. The residence time of this precursor state is estimated by assuming a molecularly physisorbed state for the precursor state and assuming a pairwise interaction energy of Lennard-Jones 12-6 potential between an admolecule and each substrate nickel atom. The sticking coefficients are also calculated from the isotherms. The calculated results agree well with those obtained by others with different methods
The Time Correlation Functions of Concentration Fluctuations in the Lotka Model near the Oscillatory Marginal Steady State
Kim Cheol-Ju ; Lee Dong Jae ; Ko Seuk Beum ; Shin Kook Joe ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 36~40
The time correlation functions of concentration fluctuations due to the random forces near the steady state are evaluated for a general two-component nonlinear chemical system by solving the corresponding two dimensional Fokker-Planck equation. The approximate method of solving the Fokker-Planck equation is based on the eigenfunction expansion and the corresponding eigenvalues for both the linear and nonlinear Fokker-Planck operators are obtained near the steady state. The general results are applied to the Lotka model near the oscillatory marginal steady state and the comparison is made between linear and nonlinear cases.
The pH Dependence of Metal Tetrakis (4-sulfonato-phenyl) porphine Structure Probed by Raman Spectroscopy
Yoon Minjoong ; Chang Jae-Rim ; Kim Dongho ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 40~44
The pH dependence studies of Raman spectra are reported for water-soluble free-base, Zn, Co and Cu tetrakis (4-sulfonatophenyl) porphine in pH 4, pH 7 and pH 13.9 aqueous solution. For free base porphine, the substantial differences are found in absorption and Raman spectra between pH 4 and pH 7 or pH 10 aqueous solutions due to the protonation at low pH. For Zn and Co porphyrins, the hydrolysis equilibrium constants are obtained by spectrophotometric titration experiments. The consistent shifts in Raman frequencies are found at high pH due to the hydrolysis. For Cu porphyrins, instead of hydrolysis the aggregation effect is detected at high pH through the absorption and Raman studies.
Evaluation of a Radical Mechanistic Probe for NADH-dependent Horse Liver Alcohol Dehydrogenase Reactions by Computer Graphics Modeling
Chung Sung Kee ; Chodosh Daniel F. ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 44~48
The feasibility of the reduction of nortricyclanone (1) as a chemical probe for testing the proposed radical mechanism for NAD-dependent horse liver alcohol dehydrogenase (HLADH) reactions has been examined using computer graphics modeling. The resutls of this study suggest that the radical ring-opening of this probe molecule may involve too substantial a geometry reorganization for the molecule to serve as a chemical probe in detecting the possible presence of the radical intermediates in the HLADH reactions. This result suggests that one should exercise caution in extrapolating results obtained from chemically based radical probes in the solution phase to the topologically constrained systems such as enzyme-substrate reactions.
Direct Transformation of Carboxylic Acids into Aldehydes through Acyloxy-9-borabicyclo[3.3.1]nonane
Cha Jin Soon ; Oh Se Yeon ; Lee Kwang Woo ; Yoon Mal Sook ; Lee Jae Cheol ; Kim Jin Euog ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 48~52
New methods for the direct reduction of carboxylic acids to aldehydes through the treatments of B-acyloxy-9-borabicyclo[3.3.1]nonane (acyloxy-9-BBN) with tert-butyllithium and 9-borabicyclo[3.3.1]nonane or with lithium 9-boratabicyclo[3.3.1]nonane (Li 9-BBNH) are described. Both these systems provide the corresponding aldehydes from various carboxylic acids in high yields. A mechanism for the recuction through stepwise treatment of acyloxy-9-BBN with tert-butylithium and 9-BBN, which seems to involve the hydride migration through 9-BBN, is proposed and discussed in connection with the reduction through treatment of acyloxy-9-BBN with Li 9-BBNH.
The Syntheses of p-Acylcalixarenes
No Kwanghyun ; Kim Younhee ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 52~55
Starting with readily available p-tert-butylcalixarene 3 tert-butyl groups are removed by
-catalyzed de-alkylation reaction, and the calixarene 4 formed is converted into the tetraacyl esters. These compounds undergo Fries rearrangement to yield p-acylcalixarenes. p-Acetyl, p-propionyl, p-butyryl, and p-benzoylcalixarene 10, 11, 12 and 14 are synthesized in 70-80% yields by treatment of the corresponding esters 5, 6, 7 and 9 with
in nitrobenzene. When the tetraisobutyryl ester 8 was treated with the same condition, only two isobutyryl groups were rearranged to the para-positions of calixarene, and remaining two groups were simply cleaved.
Gamma-Radiolysis of Carbon Dioxide (IV). Effect of the Addition of Alcohols on the Gamma-Radiolysis of Gaseous Carbon Dioxide
Jin Joon Ha ; Choi Jae Ho ; Pyun Hyung Chick ; Choi Sang Up ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 55~59
The gaseous carbon dioxide has been irradiated with Co-60 gamma-radiation in the presence and absence of various alcohols, and the radiolysis products analyzed by gas chromatography. Experimental results indicate that no detectable amount of carbon monoxide is formed when pure carbon dioxide is irradiated. By adding small quantities of alcohols to carbon dioxide, however, considerable amount of carbon monoxide, ketones, alcohols and other organic products have been detected. By adding 0.1% of methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-methyl-l-propanol, 2-butanol, and 2-methyl-2-propanol, G(CO) values obtained are 4.4, 4.5, 5.2, 4.4, 5.2, 5.0, 4.7 and 4.1, respectively. These high yields of carbon monoxide suggest that the oxidation reactions of carbon monoxide may be suppressed by scavenging oxygen atom with the alcohols. The main radiolytic decomposition reactions of the alcohols present in small quantity in carbon dioxide may be supposed to be the reactions with the oxygen atom produced by the radiolysis of carbon dioxide. The decomposition reactions seems to follow pseudo-first order kinetics with respect to the alcohols. The decomposition rate measured with 2-propanol is the fastest and that with 2-methyl-2-propanol the slowest. The mechanisms of the radiolytic decomposition reactions of the alcohols present in carbon dioxide are discussed on the basis of the experimental results of the present study.
Oxidation of Alcohols by Ca(OCl)
Kim Kwan Soo ; Song Yang Heon ; Hahn Chi Sun ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 60~61
Iron Carbonyl Complex Catalyzed Carbonylation of Xylylene Dihalides under Phase Transfer Catalyst (I)
Shim Sang Chul ; Park Woo Hyun ; Doh Chil Hoon ; Lee Hak Ki ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 61~62
Enantioselective Reduction of Racemic Three-Membered Heterocyclic Compounds. 2. Reaction of Epoxides and Episulfides with (-)-Diisopinocamphenylborane in the Presence of Lithium Chloride
Cha Jin Soon ; Lee Kwang Woo ; Yoon Nung Min ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 62~64
An Electrochemical Study on the Formation and Growth of Conducting Polyaniline
Chon Jung-Kyoon ; Kim Jin-Doo ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 64~66
-Unsaturated Carboxylic Acids from Carbonyl Compounds and 1,1-Bis(trimethylsiloxy)-2-(trimethylsilyl)ethene
Chung Bong Young ; Kim Mi Soo ; Lee Seung Dal ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 67~67
Salt Effects in Electron-Transfer Induced Photooxygenation of 1,1-Diphenyl-2-Vinylcyclopropane
Shim Sang Chul ; Lee Hyung Jae ;
Bulletin of the Korean Chemical Society, volume 9, issue 1, 1988, Pages 68~69