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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Bulletin of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Byeong Moon Kim
Volume & Issues
Volume 20, Issue 12 - Dec 1999
Volume 20, Issue 11 - Nov 1999
Volume 20, Issue 10 - Oct 1999
Volume 20, Issue 9 - Sep 1999
Volume 20, Issue 8 - Aug 1999
Volume 20, Issue 7 - Jul 1999
Volume 20, Issue 6 - Jun 1999
Volume 20, Issue 5 - May 1999
Volume 20, Issue 4 - Apr 1999
Volume 20, Issue 3 - Mar 1999
Volume 20, Issue 2 - Feb 1999
Volume 20, Issue 1 - Jan 1999
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A Ficile Synthesis of partly-fluorinated organic Compounds Using Perfluoropropoxyethylene and Amines
지기환 ; G. G. Furin ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 495~495
A Ficile Synthesis of partly-fluorinated organic Compounds Using Perfluoropropoxyethylene and Amines
지기환 ; G. G. Furin ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 499~502
Synthesis of Pyranopyridines: LiCl Mediated Palladium-Catalyzed Cyclization of Iodo(3-butenyloxy)pyridines
강승규 ; 음을건 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 503~504
Synthesis and Characterization of Aromatic Dianhydrides Containing Imide Precursor Units
금동기 ; 이광섭 ; 강용구 ; 이창진 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 505~507
by the PVA-procursor Method and the Effect of Air Flow During the Pyrolysis
권호진 ; 김근배 ; 김수주 ; 송미영 ; 박선희 ; 권혜영 ; 박동곤 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 508~516
Polycrystalline powder of LixNi0.85Co0.15O2 was synthesized by pyrolyzing a powder precursor obtained by the PVA-precursor method. Coin cells of lithium-ion rechargeable battery were assembled, whose the cathodes were fabricated from the crystalline powders of LixNi0.85Co0.15O2 synthesized by the method. The effect of synthetic variation on the property of the cell was tested by carrying out 100 consecutive cycles of charge-dis-charge on the cells. The property of the cell was largely influenced by the pyrolysis conditions applied for the synthesis of the LixNi0.85Co0.15O2. Depending on whether the pyrolysis was carried out in standing air or in the flow of dry air, the discharge capacity and cycle-reversibility of the cell varied in large extent. When the powder precursor was pyrolyzed in standing air, a minor phase of lithium carbonate was remained in the LixNi0.85Co0.15O2. The carbon containing powder precursor had to be pyrolyzed in the flow of dry air to eliminate the minor phase. In the flow of dry air, the lithium carbonate in the precursor was eliminated over 500-700。C without any prominent heat event. By controlling the flow of air over the precursor during its pyrolysis, particle size could also be altered. The effect of flowing dry air, during first step pyrolysis or during second step heat treatment, on the property of the cell was discussed.
Crystallization of Forsterite Xerogel under Carbon Dioxide: A New Crystalline Material Synthesized by Homogeneous Distribution of Carbonaceous Component into Forsterite Xerogel
송미영 ; 김수주 ; 권혜영 ; 박선희 ; 박동곤 ; 권호진 ; 권영욱 ; James M. Burlitch ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 517~524
By heating the magnesiumsilicate (Mg2SiO4:forsterite) xerogel in carbon dioxide, carbonaceous component was intentionally introduced into the amorphous solid precursor. Carbon was introduced homogeneously as unidentate carbonate. Upon being heated at 800 。C in carbon dioxide, the xerogel which had homogeneously distributed carbonaceous component in it crystallized into a single phase product of a new crystalline material, which had approximate composition of Mg8Si4Ol8C. The powder X-ray diffraction pattern of the new crystalline material did not match with any known crystalline compound registered in the powder diffraction file. Crystallization from amorphous xeroget to the new crystalline phase occurred in a very narrow range of temperature, from 750 。C to 850 。C in carbon dioxide, or in dty oxygen. Upon being heated above 850 。C, carbonaceous component was expelled from the product, accompanied by irreversible transition from the new crystalline material to forsterite.
Application of Variable Selection for Prediction of Target Concentration
김선우 ; 김연주 ; 김종원 ; 윤길원 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 525~527
Many types of chemical data tend to be characterized by many measured variables on each of a few observations. In this situation, target concentration can be predicted using multivariate statistical modeling. However, it is necessary to use a few variables considering size and cost of instrumentation, for an example, for development of a portable biomedical instrument. This study presents, with a spectral data set of total hemoglobin in whole blood, the possibility that modeling using only a few variables can improve predictability compared to modeling using all of the variables. Predictability from the model using three wavelengths selected from all possible regression method was improved, compared to the model using whole spectra (whole spectra: SEP = 0.4 g/dL, 3-wavelengths: SEP=0.3 g/dL). It appears that the proper selection of variables can be more effective than using whole spectra for determining the hemoglobin concentration in whole blood.
The Synthesis of 6-Aryl-2,4-dioxoperhydro-1,3,5-triazines
Munawar Ali Munawar ; Azhar Masud Chaudhary ; Makshoof Athar ; Muhammad Siddiq ; Abdul Rauf ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 528~530
The synthesis of a series of 6-aryl-2,4-dioxoperhydro-1,3,5-triazines by the condensation of biuret with aromatic aldehydes in trifloroacetic acid, is described.
Photochemical Formation of 1,5-Diketones from Dibenzoylmethane and Some Quinones
김성식 ; 임진선 ; 이종명 ; 심상철 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 531~534
Irradiation (300 nm UV light) of dibenzoylmethane and 1,4-naphthoquinone in dichloromethane gave 1,5-dike-tone as the major product, along with β-hydroxyketone as the minor product. Anthraquinone and anthrone also added photochemically to dibenzoylmethane to give 1,5-diketones as the major products. In contrast, tetrahalo-1,4-benzoquinones added to dibenzoylmethane to give two types of 1,5-diketones via oxetane and cyclobutane intermediates. Comparison of the potential energy values of the photoproducts reveals that the 1,5-diketones are more stable than the corresponding oxetanes or cyclobutanes due to the ring-strain of the bicyclic compounds.
Synthesis and Catalytic Activity of Water-Soluble Iridium-Sulfonated Triphenylphosphine Com;lex. Hydration of Nitriles
진종식 ; 김상열 ; 주광석 ; 원경식 ; 종대성 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 535~538
Five coordinated water-soluble iridium(l) complex, IrH(CO)(TPPTS)3 (1) (TPPTS = P(m-C6H4SO3Na)3-xH2O) has been prepared from the reaction of IrCl3·3H2O with TPPTS and HCHO in H2O/EtOH solution. Complex 1 catalyzes the hydration of nitrites (RC ≡ N, R = CH3, CICH2, CH3(CH2)4, Ph) in aqueous solution to give the corresponding amides (RCONH2) at 100℃. The hydration of unsaturated nitrites (R'C ≡ N, R'=CH3CH=CH, CH3OCH=CH, trans-PhCH=CH, CH2=C(CH3)) takes place regioselectively on-C ≡ N group to give unsaturated amides (R'CONH2) leaving the olefinic group intact. The yields of the amides seem to be depending on the electrophilicity of the carbon of nitrile: The more the electron withdrawing ability of the substituents on nitrites, the more amides are obtained. The hydration of dinitriles (NC-R-CN, R=(CH2)4, (CH2)6) with complex 1 initially gives mono-hydration products (NC-R-CONH2) which are slowly hydrated further to give dihydration products (H2NCO-R-CONH2). The hydration of 1,4-dicyanobutane has been found to be somewhat faster than that of 1,6-dicyanohexane.
Photocyclization of α-(o-Ethylphenyl)acetophenone in Zeolites
노태희 ; 최경인 ; 권혁순 ; 장동조 ; 박봉서 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 539~542
The diastereoselectivity in the photocyclization of α-(o-ethylphenyl)acetophenone(1) to 1-methyl-2-phenyl-2-indanol was studied in zeolites X and Y, and compared with that in isotropic solvents. The yields of E-diastereomer at the irradiation of 1 in protic solvents were higher than those in aprotic solvents. The ratios of E-diastereomer to Z-diastereomer in zeolites X and Y were much higher than those in isotropic solvents. The E/Z ratios at the irradiation of 1 in zeolites X were also found to be dependent on the cations present. As the cation size increased from Li+ to Cs+, the ratio decreased. However, any pattern in the E/Z ratios was not found in zeolites Y. The diastereoselectivity observed in the zeolites was interpreted by the conformational restriction imposed by the cavity size. An efficient oxidation of 1 in zeolites RbX and CsX was also observed.
NMR Studies of the Interaction between Cytochrome c3 and ferredoxin I from D. Vularis Miyazaki F
박장수 ; 정인철 ; 김안드레 ; 박남규 ; 김동구 ; 서홍석 ; 강신원 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 543~546
Heme assignment of the 1HNMR spectrum of cytochrome c3 of D. vulgaris Miyazaki F was established [Reference: 12, 13]. The major reduction of the heme turned out to take place in the other of heme 4, 1, 2 and 3 (in the sequential numbering). The Hemes with the smallest and greatest solvent accessibility were reduced at the highest and lowest potentials in average, respectively. A cooperation interheme interaction was attributed to a pait of the closest hemes, namely, hemes 1 and 2. This assignment can provide the physicochemical bases for the elucidation of electron transfer of this protein.
Photoreaction of 1-(o-Acetoxyphenyl)-2-pentamethyldisilanyl Ethyne
심상철 ; 박승기 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 547~550
Irradiation of 1-(o-acetoxyphenyl)-2-pentamethyldisilanyl ethyne 2 in benzene yields the photo-Fries rearrangement products 5 and 6 and a photoproduct 4 via silacyclopropene intermediate.
Synthesis of 11-Deoxydaunomycinone and Novel 10-Fluoroanthracyclinone Derivatives
Rho, Young S. ; 최영희 ; 김규일 ; 신홍식 ; 유동진 ; 정채준 ; 김선하 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 551~555
11-Deoxydaunomycinone 15 and 10-fluoroanthracyclinone derivatives 9, 10 were obtained. Naphthalenone 4 prepared from 2-(2,4-pentadienyl)-1,3-dioxane 2 with methyl vinyl ketone and hydrolysis with HClO4 was condensed with phthalidesulfone 5 through Michael type reaction, and was converted to 7 by epoxidation. Epoxide 7 was transformed to trione 12 using reduction-oxidation or hydrofluorination process, and then to 15 by introducing several functional groups. Compound 8 obtained in the course of the reaction of epoxide 7 and HF/ Pyr was used for the synthesis of compounds 9, 10.
Lead-selective PVC Membrane Electordes Based on Bis(Crown ether)s
오금철 ; 강은철 ; 정규성 ; 팽기정 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 556~558
Lead-selective PVC membrane electrodes based on newly synthesized bis(crown ether)s containing 18-crown-6 moiety was prepared using standard PVC membrane composition. In order to monitor lead in environmental samples by lead sensor, especially good selectivity over alkali and alkaline earth metals has to be obtained. Thus, responses of the PVC membrane prepared with new bis(crown ether)s and Fluka ionophore V (crown ether) base to various cations include lead, alkali and alkaline earth metal ions were investigated for their use as a lead sensor. The polymeric liquid membrane based on trans-1 8-crown-6 ether exhibits the best overall potentiometric performances as a lead-selective electrode in terms of a wide linear dynamic range (between 10-6 and 10-2 M, Pb2+), excellent detection limit (less than 10-6 M) and good durability within limited error. The preferences of lead over other cations, such as Ag+, Hg2+, Na+, Ca2+ and even K+ in the aforementioned electrode are much better than the Fluka ionophore V system.
Theoretical Studies on the Gas-Phase Alkylation of Delocalized Ambident Anions with Methyl Fluoride
이익춘 ; 박형연 ; 한인숙 ; 김창곤 ; 김찬경 ; 이본수 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 559~566
Gas-phase alkylations of delocalized ambident anions, Y---CH---X- where X, Y=CH2, O, or S, have been investigated theoretically at the MP2/6-31+G*//MP2/6-31+G* and QCISD/6-31+G*//MP2/6-31+G* lev-els. O-and S-alkylations (X=O and S) are more favored kinetically by ΔE^≠ = 4.6 and 9.8 kcal mol-1 than the respective C-alkylations even though they are thermodynamically less favored by 22.4 and 6.0 kcal mol-1 respectively. It was found that the transition structures for the C-alkylations are imbalanced due to the endoergic rehybridi-zation of the carbon center from sp2 to sp3 which leads to premature bond contraction of the C-Y bond and delayed bond stretching of the C-X bond. In the O-, or S-alkylation, such endoergic process is not required since the σ-lone pair on O or S is involved in the initial stage of alkylation. The imbalanced TSs for the C-alkylation are accompanied by higher intrinsic barriers and deformation energies.
Synthesis and Cationic Polymerization of Vinyl Ethers Containing Oxynitrobenzylidenemalononitrile and Oxynitrobenzylidenecyanoacetate as the NLO-phores in the Side Chain
이주연 ; 김무용 ; 안미라 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 567~572
5-Nitro-2-(2'-vinyloxyethoxy)benzylidenemalononitrile (2a), methyl 5-nitro-2-(2'-vinyloxyethoxy)benzylidenecyanoacetate (2b), 3-nitro-4-(2'-vinyloxyethoxy)benzylidenemalononitrile (4a), methyl 3-nitro-4-(2'-vinyloxyethoxy)benzylidenecyanoacetate (4b), 2-nitro-5-(2'-vinyloxyethoxy)benzylidenemalononitrile (6a), and methyl 2-nitro-5-(2'-vinyloxyetboxy)benzylidenecyanoacetate (6b) were prepared by the condensation of 5-nitro-2-(2'-vinyloxyethoxy)benzaldehyde (1), 3-nitro-4-(2'-vinyloxyethoxy)benzaldehyde (3), and 2-nitro-5-(2'-vinyloxyethoxy)benzaldehyde (5) with malononitrile or methyl cyanoacetate, respectively. Vinyl ether monomers 2a-b, 4a-b, and 6a-b were polymerized with boron trifluoride etherate as a cationic initiator to yield poly(vinyl ethers) 7-9 having oxynitrobenzylidenemalononitrile and oxynitrobenzylidenecyanoacetate, which is effective chromophore for second-order nonlinear optical applications. Polymers 7-9 were soluble in common organic solvents such as acetone and DMSO. Tg values of the resulting polymers were in the range of 67-83 ℃. Electrooptic coefficient (r33) of the poled polymer films were in the range of 15-27 pm/V at 633 nm. Polymers 7-9 showed a thermal stability up to 300 ℃ in TGA thermograms, which is acceptable for NLO device applications.
The Studies on Substituent and Kinetic Solvent Isotope Effect in Solvolyses of Phenyl Chloroformates
구인선 ; 이지선 ; 양기열 ; 강금덕 ; 이익춘 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 573~576
The rate constants and kinetic solvent isotope effects (KSIE, KMeOH/kMeOD) for solvolyses of para-substituted phenylchloroformates in CH3OH, CH3OD, H2O, D2O, 50% D2O-CH3OD were determined at 15.0 and 25.0℃ using conductometric method. Kinetic solvent isotope effects for the solvolyses of para-substituted phenyl chloroformates were 2.39-2.51, 2.21-2.28, and 1.67-1.69 for methanol, 50% aqueous methanol, and water, respectively. The slopes of Hammett plot for solvolysis of para-substituted phenyl chloroformates in methanol, 50% aqueous methanol, and water were 1.49, 1.17 and 0.89, respectively. The Hammett type plot of KSIE, log (KSIE) versus p, can be a useful mechanistic tool for solvolytic reactions. The slopes of such straight lines for para-substituted phenyl chloroformates are almost zero in methanol, 50% aqueous methanol, and water. It was shown that the reaction proceeds via an associative SN2 and/or general base catalysis addition-elimination (SAN) mechanism based on activation parameters, Hammett p values, and slopes of Hammett type plot of KS-IE.
Transition-State Variation in the Solvolyses of Phenyl Chlorothionoformate in Alcohol-Water Mixtures
구인선 ; 양기열 ; 강대호 ; 박혜진 ; 강금덕 ; 이익춘 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 577~580
Solvolyses of phenyl chlorothionoformate in water, D2O, CH3OD, 50% D2O-CH3OD, and in aqueous binary mixtures of acetone, ethanol and methanol are investigated at 25.0℃. The Grunwald-Winstein plots of firstorder rate constants for phenyl chlorothionoformate with Ycl (based on 2-adamantyl chloride) show a dispersion phenomenon, and also the extended Grunwald-Winstein plots show a poor correlation for the solvolyses of phenyl chlorothionoformate. The ring parameter (I) has been shown to give considerable improvement when it is added as an hI term to the original and extended Grunwald-Winstein correlations. The dispersions in the Grunwald-Winstein correlations in the present studies are caused by the conjugation between the reaction center and the aromatic ring in the vicinity of the reaction center. This study has shown that the magnitude of l and m values associated with a change of solvent composition leads to predict the SN2 transition state. The kinetic solvent isotope effects determined in deuterated water and methanol are consistent with the proposed mechanism of the general base catalyzed SN2 mechanism.
Syntheses and Potentiometric Properties of Polyethers Containing Thiazole and Oxazole Derivatives
최준혁 ; 고영국 ; 권일전 ; 김홍석 ; 박현주 ; 김상진 ; 차근식 ; 남학현 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 581~586
A series of polyethers containing the thiazole or oxazole subcyclic moiety have been synthesized. Reaction of 2-aryl-4-hydroxymethylthiazole with tetra- and pentaethylene glycol di-p-tosylate in THF provided corresponding α,ω-bis[2'-aryl-4'-methylthiazole]polyethylene glycol in good yields. Similar treatment of 2-phenyl-4-hydroxymethyloxazole 7 and 2-phenyl-5-hydroxymethyloxazole 8 with tetraethylene glycol di-p-tosylate yielded the corresponding 1,13-bis [2'-phenyl-4'-methyloxazole]tetraethylene glycol 16 and 1,13-bis[2'-phenyl-5'-methyloxazole]tetraethylene glycol 17 in 69 and 43% yields in respectively. The potentiometric properties of PVC-based ion selective membranes containing 66 wt% o-nitrophenyloctyl ether (NPOE) and 4 wt% polyethers 9-17 have been examined. The membranes containing thiazole and oxazole polyether derivatives exhibited high selectivity toward silver (I) ion. It was observed that the response slopes of the electrodes to silver ion vary with the length of polyether chain linking two thiazole subcyclic moiety. Potentiometric data suggest that the number of ether units, CH2OCH2, for phenylthiazole derivatives be greater than 5 to result in near-Nernstian response. However, the response behaviors of the membrane electrodes based on phenyloxazole podands 16 and 17, which have different orientation, were correspondingly similar to those of the electrodes based on phenylthiazole podands 9 and 10. On the other hand, the ISEs based on thiazole polyether derivatives with different terminal substituents, e.g., phenyl 10, naphtyl 14, and thienyl 15, except that with pyridyl 12, exhibited little difference in their potentiometric properties.
Molecular Dynamics Simulation Studies of Zeolite A. VIII. Structure and Dynamics of Na+ ions in a Non-Rigid Dehydrated Zeolite-A Framework
이송희 ; 최상구 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 587~591
A molecular dynamics simulation study on the structure and dynamics of Na+ ions in non-rigid dehydrated Na12-A zeolite framework at 298.15 K was conducted using the same method reported in previous studies on rigid and non-rigid Na12-A zeolite frameworks. The agreement between the experimental and calculated results for the zeolite-A framework atoms of structural parameters for non-rigid dehydrated Na12-A zeolite is generally quite good, and for the adsorbed Na+ions the agreement is acceptable. The calculated bond lengths are generally in good agreement with the experimental results and other theoretical data. The calculated IR spectrum by Fourier transform of the total dipole moment autocorrelation function shows two major peaks around 2700 cm-1 and 7000 cm-1. The former appeared in the calculated IR spectra of non-rigid zeolite-A framework only system and the latter remains unexplained except, perhaps, indicating a new formation of a vibrational mode of the framework due to the adsorption of Na+ ions. The peaks above 6200-6800 cm-1 in non-rigid dehydrated Nal2-A zeolite are much larger than those in non-rigid dehydrated H12-A zeolite.
Structure and Stability of Unprotonated Ammonia Cluster Cations
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 592~594
The Characterization of Toluene-p-tibutylcalixarene Complexes Using Thermal Analyses
최성신 ; 남계천 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 595~596
Photocurrent Stability of CdS Sensitized TiO₂ Electrodes
홍진섭 ; 정중우 ; 채원석 ; 김강진 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 597~599
Synthesis and Characterization of o-Carboranylmethylenephosphine. Crystal Structure of
김대현 ; 이흥새 ; 고재정 ; 박권일 ; 조성일 ; 손정인 ; 강상욱 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 600~604
Synthesis and Characterization of Novel One-dimensional Chalcogenide Compound of
박윤봉 ; 윤혜식 ; 오화석 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 605~608
Decarbonylative Diarylation Reaction of N-Substituted α-Amino Acids
성미라 ; 김태이 ; 이홍정 ; 김재영 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 609~610
Synthesis and Structural Aspects of Macrocyclic Compounds Containing 5-Amino-3H-1,3,4-thiadiazolin-2-one Subunits
조남숙 ; 박흥수 ; 황혜정 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 611~613
A Gradient μLC/MS System Connected with a Glass Connector Cured by the Supper-glue and Some Test Runs with It
정원조 ; 이충식 ; 배운미 ; 유종신 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 614~618
Total Synthesis of (R)-(-)-Sulcatol, (2R)-6-Methyl-5-hepten-2-ol
이기형 ; 박창식 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 619~620
DFT Studies of the Diels-Alder Reaction of 1,4-Diaza-1,3-butadiene with Acrolein
이갑용 ; 김하영 ; 한인숙 ;
Bulletin of the Korean Chemical Society, volume 20, issue 5, 1999, Pages 621~623