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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 8, Issue 6 - Dec 1987
Volume 8, Issue 5 - Oct 1987
Volume 8, Issue 4 - Aug 1987
Volume 8, Issue 3 - Jun 1987
Volume 8, Issue 2 - Apr 1987
Volume 8, Issue 1 - Feb 1987
Selecting the target year
Immobilization of Polysiloxane Liquid Phase on the Gas Chromatographic Solid Supports via In-Situ Cross-Linking
Kim, Kyoung-Rae ; Zlatkis, Albert ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 133~137
Polysiloxane SE-54 liquid phase was immobilized on the support surface as coated in thin film via in-situ cross-linking. The cross-linking between liquid molecules was initiated by dicumylperoxide. Among the supports investigated, only Chromosorb W provided the cross-linkable surface. The optimal in-situ cross-linking was achieved when Chromosorb W was coated with 5% (w/w) SE-54 and cross-linked with 1% (w/w) dicumylperoxide. The cross-linked support was useful for the trace analysis as well as for the trace enrichment.
Preparation and Properties of New Metal-chain Compounds with Commensurate Peierls Structure
Lee, Kuk-Haeng ; Kim, Ja-Hong ; Mizuno, Masagi ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 137~140
New platinum chain compounds,
where M = Cu or Pt, en = ethylenediamine and ox = oxalate, have been prepared and found to have a commensurate Peierls structure as evidenced by the five-fold Pt chain periodicity and unusually low electrical conductivity
. Including two other compounds with the Peierls structure, their characteristic features were deduced and explained from the point of view of the band theory.
Lewis Acid Catalysis of Coumarin and 5,7-Dimethoxycoumarin Photodimerization
Shim, Sang-Chul ; Kim, Eun-Il ; Lee, Ki-Taek ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 140~144
The effect of Lewis acids on spectroscopic properties and photodimerization of coumarin and 5,7-dimethoxycoumarin was investigated. Quantum yields of coumarin photodimerization increase in the presence of
but those of 5,7-dimethoxycoumarin decrease. The spectroscopic properties of the coumarin-
complexes were studied by UV, IR,
NMR and fluorescence spectroscopy.
Comparing the Stability of Geometrically rigid Tricyclopropyl Carbinyl Cations by
F NMR Spectroscopy
Shin, Jung-Hyu ; Kim, Kyong-Tae ; Shin, Hun-Woo ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 144~145
The relative stability as function of geometry in the rigid tricyclopropylcarbinyl cations with varied bond angle (
) between the plane of cyclopropane ring and the bond connecting cyclopropane ring to cationic carbon was examined by
nmr spectroscopy. 7-p-Fluorophenyltricyclo[2.2.2.
]octan-7-yl(4) and 8-p-fluorophenyltricyclo[3.2.2.
]nonan-8-yl cation (8) were generated from corresponding tertiary alcohols under stable ion conditions, and their
chemical shifts were compared with those of model compounds such as 7-nortricyclyl cation (3) and tricyclo[3.3.1.
]octan-8-yl cation (7). Consequently, it is concluded that the varied orientation of bond angle (
) within in the bisected conformation does not affect degree of the charge delocalization into cyclopropane ring.
The out-of-plane Band Contour of Dichloroborane Molecules
Lee, Kuk-Haeng ; Kim, Ja-Hong ; Sohn, Sung-Ho ; Shim, Sang-Chul ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 147~149
The out-of-plane bending, vibrational-rotational FT-IR spectra of dichloroborane molecule were analyzed. The band centers are 785.992, 785.723, 647.217, and 646.997
and centrifugal distortion constants are
, respectively. The theoretical spectrum of
was plotted to conform the molecular constants and the rotational constants for the first excited vibrational state of this molecule were A' = 1.165932, B' = 0.106166, and C' = 0.097229
. The calculated spectra were in good agreement with the observed spectra.
A Study on a New Method of Measurement of Pore Volume Distribution in Porous Materials by Adsorption of Gases
Lee, Jo-Woong ; Chang, Sei-Hun ; Choo, Kwang-Yul ; Yoon, Jae-Shin ; Chung, Won-il ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 150~155
A new method of measurement of pore volume distribution in a porous material by adsorption of gases is proposed. In the newly proposed method the use of spherical molecules with relatively large molecular weight as adsorbates is strongly recommended to eliminate the troubles caused by stereospecificity and low boiling point of widely used
. It is also claimed that the universal t-curves that have been widely used since proposed by de Boer et al. must be replaced by the flat-surface isotherms that can be derived from the theory proposed by Chang et al. The results of analysis of pore volume distribution based on the method described in this paper are found to be reasonable and satisfactory.
Theoretical Studies on Aluminophosphate-5 (AlPO
Choi, Kyung-Jae ; Jhon, Mu-Shik ; No, Kyeong-Tae ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 155~157
Parameters of intraframework potential function suitable for aluminophosphate-5(
) are obtained by the constraint method. Using these parameters, we calculated the stabilization energies and their second derivatives of framework atoms and these values are compared with those of zeolite A. It is found that the oxygen atoms in
framework are more stable than those of zeolite A and that the aluminum atom is also more stable than that of zeolite A. On the other hand, the phosphorus atom in
framework, in which the silicon atoms of aluminosilicate are replaced by the phosphorus atom, is less stable than the silicon atom of aluminosilicate framework of dehydrated zeolite A.
Surface and Interfacial Energetic Analysis of Amphiphilic Copolymers
Kim, Min-Kyun ; Yuk, Soon-Hong ; Jhon, Mu-Shik ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 158~161
A Series of hydrophilic-hydrophobic copolymeric surfaces of 2-hydroxyethyl methacrylate (HEMA) and various alkyl methacrylate (RMA) have been prepared by in-situ solution copolymerization using a redox radical initiator. Contact angles of various probing fluids on the polymeric surfaces were determined in air (hydrophobic environment) and under water (hydrophilic environment). From contact angle data, the dispersive interaction contribution (
) and the polar contribution (
) to the total surface free energy (
) and interfacial energetic quantities (e.g., water-polymer, liquid-polymer interface, etc.) were estimated by surface and interface physicochemical theory. From the comparison of surface energetic components between hydrophobic and hydrophilic media, it is found that surface and interface energetic components of polymeric surface as a representative low-energy surface are highly dependent on environmental fluids. Also, from the correlation between interfacial energetic results and surface energetic criterion of biocompatibility, we found that HEMA/BMA, HEMA/HMA copolymer systems are in the region of biocompatibility.
Selective Reduction of Carbonyl Group with Borohydride Exchang Resin (BER)-LiCl System
Gyoung, Young-Soo ; Yoon, Nung-Min ; Jeon, Dae-Hoon ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 162~165
The reduction rate of borohydride exchange resin (BER) was greatly enhanced in the presence of lithium salts. Thus 2-heptanone was reduced completely with BER-LiCl in 1 h at room temperature. However, no reduction was observed with BER alone under the same conditions. With this system, organic compounds containing various fuctional groups were examined in ethanol at room temperature. This study revealed that BER-LiCl system exhibits an excellent chemoselectivity for carbonyl group in the presence of other functional groups. Keto esters and epoxy ketones were reduced with BER-LiCl to give the corresponding hydroxy esters and epoxy alcohols with excellent yields. Selective reductions of carbonyl groups were also possible in the presence of other organic compounds containing functional groups such as 1-idooctane, 1-bromooctane, caproamide, hexanenitrile, nitrobenzene, n-butyl disulfide, dimethyl sulfoxide and 1-dodecene.
A Route for Sulfuranyl Radical by an Electron Transfer from Sodium Naphthalenide to a Triarylsulfonium Salt
Kim, Kyong-Tae ; Bae, Hye-Kyung ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 165~167
Reaction of 5-(2-thianthreniumyl)thianthrene perchlorate with sodium naphthalenide in the presence of benzenethiol in tetrahydrofuran at -
proceeded via a formation of a sulfuranyl radical to give thianthrene (66%), 2-phenylthiothianthrene (33%), phenyl 2-(2-thianthrenylthio)phenyl sulfide (traceable amount), and some unknowns, along with naphthalene and very small amount of 1,4-dihydronaphthalene.
Structural Studies on Cyclic Compounds. Substituent Effects on the Reducing Ability of Dihydropyridines
Koh Park, Kwang-Hee ; Moon, Gyeoung-Un ; Kwon, Ki-Sung ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 168~170
The reaction between 1-benzyl-3-carbamoyl-1,4-dihydropyridine (BNAH) 1 and various 1-arylpyridinium salts 2, and the reaction between 1-(4-methylphenyl)-1,4-dihydropyridine 4b and 1-aryl-3-carbamoylpyridinium (1-arylnicotinamide) salts 5 were carried out. The extents of reaction in equilibrium were estimated by nmr integration data. The equilibrium constants for the reactions, K, and the standard Gibbs free energy changes for the reduction of the pyridinium salts to the corresponding 1,4-dihydropyridines
were evaluated. The Hammett plot of log K for the reaction between 1 and 2, and
of the substituents in 1-aryl moiety shows linear correlation with the reaction constant
of 9.4 (for log K vs
) and -54.5 KJ/mole (for
). It was found that 1-aryl-1,4-dihydropyridines have much higher reducing power than the corresponding 1-aryl-1,4-dihydronicotinamides, and the power is affected greatly by the electron-withdrawing ability of the substituents in aryl group. The reactions were utilized for preparation of 1,4-dihydropyridines bearing highly electron-withdrawing groups such as 4-nitrophenyl and 2,4-dinitrophenyl, which could not be obtained by conventional dithionite reduction of the corresponding pyridinium salts due to the base-labile nature of the salts.
A New Method for the Synthesis of Some Pyridazine Nucleosides
Yoon, Yong-Jin ; Wise, Dean S. ; Townsend, L. B. ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 171~173
Some pyridazin-6-one nucleosides have been prepared directly without silylation of heterocyclic base using iodine catalyst, a new type Friedel-Crafts catalyst.
Theoretical Analysis of Dipole Moment Derivatives in Fluoromethanes. (III) CH
F and CF
Kim, Kwan ; Park, Cheol-Woo ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 174~179
The results of an ab initio (6-31G) molecular orbital calculations of the dipole moment derivatives and gas phase IR intensities in
are reported. The results are compared with corresponding values obtained from a CNDO calculation. We have also analyzed the theoretical polar tensors into the charge, charge flux, and overlap contributions. The effective term charges of hydrogen atom appeared to be transferable among the fluoromethane molecules.
Synthesis and Dissociation Constants of Cationic Rhodium (I)-Triphenylarsine Complexes of Unsaturated Nitriles and Aldehyde
Chin, Chong-Shik ; Park, Jeong-Han ; Shin, Sang-Young ; Kim, Choong-Il ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 179~183
with unsaturated nitriles and aldehyde, L, produce a series of new cationic rhodium (I) complexes,
= CHCN, and trans-
= CHCHD) where L are coordinated through the nitrogen and oxygen, respectively but not through the
-system of the olefinic group. Dissociation constants for the reaction,
+ L, have been measured to be
M (L =
M (L =
M (L = trans-
CH = CHCN) and
M (L =
CN) in chlorobenzene at
, and higher than those of triphenylphosphine complexes,
where L are the corresponding nitriles that are coordinated through the nitrogen atom. The differences in dissociation constants seem to be predominantly due to the differences in
(not due to the differences in
). The weaker Rh-N (unsaturated nitriles) bonding in
complexes than in
complexes (based on
values) suggests that the unsaturated nitriles in 2∼5 are good
-donor and poor
1-Methylimidazolium Chlorochromate. A New Efficient Oxidizing Agent for Oxidation of Alcohols and Oxidative Cleavage of Oximes
Kim, Sung-Gak ; Chang, Heung ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 183~185
1-Methylimidazolium chlorochromate was prepared by the addition of 1-methylimidazole into a solution of chromic trioxide in 6M hydrochloric acid and obtained in high yield as bright yellow crystalline solids. The reagent was found to be very effective for the oxidation of alcohols and the oxidative cleavage of oximes to the corresponding carbonyl compounds.
1,4-Dicyanobutene Bridged Binuclear Iridium (I, III) Complexes and Their Catalytic Activities
Park, Hwa-Kun ; Chin, Chong-Shik ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 185~189
with dicyano olefins, cis-NCCH = CH
CN (cDC1B), trans-NCCH = CH
CN (tDC1B), trans-NC
CH = CH
CN (tDC2B), and NC
CN (DCB) produce binuclear dicationic iridium (I) complexes,
(NC-A-CN = cDC1B (1a), tDC1B (1b), tDC2B (1c), DCB (1d)). Complexes 1a-1d react with hydrogen to give binuclear dicationic tetrahydrido iridium (Ⅲ ) complexes,
(NC-A-CN = cDC1B (2a), tDC1B (2b), tDC2B (2c), DCB (2d)). Complexes 2a and 2b catalyze the hydrogenation of cDC1B and tDC1B, respectively to give DCB, while the complex 2c is catalytically active for the isomerization of tDC2B to give cDC1B and tDC1B and the hydrogenation of tDC2B to give DCB at
Synthetic beta-Lactam Antibiotics I. Synthesis and Antibacterial Activity of 7-Amino-3-[1-(halo-substituted phenyl)-1H-tetrazole-5-yl]thiomethyl-3-cepheme-4-carboxylic acids
Koh, Dong-Soo ; Park, Sang-Woo ; Kim, You-Seung ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 189~192
The syntheses of mercaptotetrazoles and cephalothin analogs are described. Their in vitro potency was established. The compounds exhibited high antibacterial activity against Gram-positive bacteria and moderate activity against Gram-negative bacteria.
Determination of Reactivity by MO Theory (Part 50). MO Studies on the Gas Phase Pyrolysis of Esters
Lee, Ik-Choon ; Park, Young-Soo ; Lee, Bon-Su ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 193~196
The gas phase pyrolyses of eight esters have been studied by MNDO-MO method. In the ethylformate pyrolysis,
-methylation had a steric releasing effect whereas
-methylation had a steric crowding in the transition state; the latter, however, is over-compensated by a greater electronic repulsion resulting in a net steric releasing effect. Considerations of formal charges and geometrical changes involved in the activation led us to propose a pyrolysis mechanism in which a preequilibrium of acidic proton transfer is followed by the rate-limiting bond polarization of
-O bond in a cyclic transition state.
A Nonlinear Theory of Diffusion-Driven Instability in the Oregonator
Lee, Myung-Ho ; Lee, Dong-Jae ; Shin, Kook-Joe ; Lee, Young-Hoon ; Ko, Seuk-Beum ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 196~200
A nonlinear theory presented previously is applied to the Oregonator, which is a model for the Belousov-Zhabotinskii reaction, to study instability near the critical point driven by diffusions. The result shows that the theory may be applied to an actual system.
Cross Interaction Between Identical Groups
Lee, Ik-Choon ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 200~202
Various useful relations involving Hammett's and
coefficients are derived for cross interactions between identical groups:
. The use of these relations enable us to correctly interprete the transition state structure. Another advantage of the use of these relations is to use
for the determination of corresponding
values instead of plotting log k vs
values for standardizing equilibria are obtained.
Photo-enhanced Reduction of Conjugated Enones with NaBH
Shim, Sang-Chul ; Yeo, Ho-Seop ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 202~205
The reduction of some cyclic conjugated enones with electron-donating substituent on C-3 by sodium borohydride was accelerated on irradiation. The photo-enhanced reduction seems to undergo through zwitterionic species formed from the (n,
) triplet state of conjugated enones, followed by hydride attack to yield unsaturated or saturated alcohols.
Photoaddition Reaction of 5,7-Dimethoxycoumarin with Adenosine
Cho, Tae-Heung ; Shim, Hyun-Kwan ; Shim, Sang-Chul ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 206~211
The photoreaction of 5,7-dimethoxycoumarin with adenosine has been carried out in a dry film state. The mixture of DMC and adenosine was irradiated with 350 nm UV light and two major products were isolated. The structure was determined by various spectroscopic measurements involving
nuclear magnetic resonance and fast atom bombardment mass spectrometry. These addition products were produced by covalent bond formation between the pyrone ring at carbon 3 or 4 and the sugar ring moiety of adenosine at carbon 5'.
Asymmetric Reduction of Prochiral Ketones with Potassium 9-O-isopinocampheyloxy-9 boratabicyclo[3.3.1]nonane
Park, Won-Suh ; Cho, Byung-Tae ; Cha, Jin-Soon ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 211~214
Asymmetric reduction of a series of aliphatic ketones and representative other classes of ketones with potassium 9-O-isopinocampheyloxy-9-boratabicyclo[3.3.1]non ane (K 9-O-Ipc-9-BBNH) was studied. All the ketones examined were reduced smoothly to the corresponding alcohols in THF at -
. Thus, the reduction of 2-butanone, 3-methyl-2-butanone, 3,3-dimethyl-2-butanone, 2-octanone, and 4-phenyl-2-butanone provides 51% ee, 61% ee, 44% ee, 35% ee, and 33% ee of optical inductions, respectively. The reduction of other classes of ketones gave 52% ee for 2,2-dimethylcyclopentanone, 47% ee for acetophenone, 23% ee for 3-acetylpyridine, 50% ee for methyl benzoylformate, 4.8% ee for 2-chloroacetophenone, 30% ee for trans-4-phenyl-3-butene-2-one, and 2% ee for 4-phenyl-3-butyn-2-one. Thus, the reagent was found to be most useful in the asymmetric reduction of acyclic and cyclic aliphatic series of ketones.
An Enantiospecific Synthesis of 4-Hexanolide (
-Caprolactone), the Sex Pheromone of the Female Dermestid Beetle Trogoderma glabrum (Herbst)
Kang, Suk-Ku ; Shin, Dong-Soo ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 215~216
Facile Cleavage of Tetrahydrofuran Derivatives with S-2-Pyridyl Thioates/
Kim, Sung-Gak ; Ko, Young-Kwan ; Lee, Jae-In ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 216~217
An Improved Synthesis of 2-Substituted-Pyrrolines
Koh, Dong-Soo ; Park Sang-Woo ; Kim, You-Seung ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 218~218
The Synthesis of Vinylphosphonates by Eliminative Deoxygenation of Sulfoxides
Oh, Dong-Young ; Kim, Taek-Hyeon ; Kang, Dong-Ho ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 219~219
Evaluation of Kinetic Parameters from Thermogravimetric Data of N-hexylammonium-Layer Silicate Intercalation Complex
Choy, Jin-Ho ; Shin, Yu-Ho ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 220~221
Internal Rotational Barriers of Ethyl Halides from SCF Calculations
Lee, Yoon-Sup ; Ryu, Ung-Sik ;
Bulletin of the Korean Chemical Society, volume 8, issue 3, 1987, Pages 221~223