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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 21, Issue 6 - Dec 1977
Volume 21, Issue 5 - Oct 1977
Volume 21, Issue 4 - Aug 1977
Volume 21, Issue 3 - Jun 1977
Volume 21, Issue 2 - Apr 1977
Volume 21, Issue 1 - Feb 1977
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HMO Correlation Diagrams for a few Competing 1,2-and 1,4-Cycloaddition Reactions
Byung Kak Park ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 155~160
HMO correlation diagrams for some competing 1,2-and 1,4-cycloaddition reactions have been made to elucidate the reaction mechanism. The main conclusions obtained from this study are as follows. 1) The crossing between the highest occupied molecular orbital and the lowest unoccupied molecular orbital was not observed, which indicates that the reaction proceeds thermally, in agreement with the experimental results. 2) From the consideration of the energy barrier in the process of the energy transformation going from reactants to product, the two-step mechanism via a diradical intermediate is preferred over the concerted one. 3) The existance of diradical intermediates can account for the observed product distributions.
Platinum(II) Complexes Containing Glycine and Styrene
Jun Moo Jin ; Peter P. Fu ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 161~170
Several Pt(II) complexes containing glycine (or glycino anion) and styrene have been prepared, and their structures have been confirmed by infrared spectroscopy. The results confirm the structure of chloro(glycino)(styrene)platinum(II) in which the nitrogen atom of the chelated glycino anion is coordinated to the platinum in the trans position to styrene (N-trans isomer).
Proton Magnetic Resonance Studies of Dipeptides
Kwon Soon Ja ; Chunghi Rhee ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 171~179
Proton magnetic resonance spectra of five glycine-containing dipeptides glycyl-L-valine, L-valyl-glycine, glycyl-DL-alanine, glycyl-DL-serine and glycyl-L-aspartic acid in
were investigated as a function of pH at room temperature. From the analysis of the spectra, it was found that the chemical shift of the
protons varies with pH as a one-step titration curve, and that the spin-spin coupling constant remains almost unchanged. Two distinct values of the chemical shift for
protons of constituent amino acids in dipeptide solutions indicate the existence of two magnetically non-equivalent sites in solution. From this study, the structures of the five dipeptides have been confirmed by proton magnetic resonance spectra and it has been suggested that the structural change, conformation and sequence determination can be explored for oligopeptides by an analysis of proton magnetic resonance spectra.
The Improved Synthesis of 1-Chloro-2-iodoperfluorocycloalkenes and 2,2'-Dichloroperfluorocycloalkenyls
Sam Kwon Choi ; Jeseph D. Park ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 180~186
The preparation of 1-chloro-2-iodoperfluorocycloalkenes was achieved with a short reaction time and a high yield when the starting compound was iodinated via the metalation process using an alkyllithium reagent. Especially, the high yield of 1-chloro-2-iodo-perfluorocyclohexene was obtained when 1,2-dichloroperfluorocyclohexene was iodinated via the same reaction conditions. The coupling reaction of 1,2-dihaloperfluorocycloalkenes was also achieved with a lower reaction temperature and a shorter reaction time when the equal slurry mixture of fluorocycloolefines and DMF was reacted at a high pressure in a sublimer. The yield of the coupling product was greatly improved by this process. For a typical example, the coupling reaction of the 1-chloro-2-iodotetrafluorocyclobutene was proceeded with a higher yield of the product than that of the reported reaction, when the present method was adopted. A plausible reaction mechanism of the present coupling reactiont was proposed and the physical characteristics of the coupling product were confirmed.
An Alternate Synthesis of 2-Amino-5,6-dimethoxy-1,2,3,4-Tetrahydronaphthalene Hydrochloride
Jack C. Kim ; Suk-kee Lee ; Chang-bae Kim ; Suk-kyu Han ; Soon-kyu Choi ; Kyung-hee Lee ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 187~192
An alternate synthesis of 2-amino-5,6-dimethoxy-1,2,3,4-tetrahydronaphthalene hydrochloride from 2-nitro-3,4-dihydro-5,6-dimethoxy-1(2H)-naphthalenone,was described and compared the overall yields and experimental procedures with the previous synthetic routes obtained from Neber rearrangement product, 2-amino-3,4-dihydro-5,6-dimethoxy-1(2H)-naphthalenone hydrochloride.
Sterol Compositions in Some Cucurbitaceae Vegetable Oils
Tae Myoung Jeong ; Min Suk Yang ; Taro Matsumoto ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 193~203
Three sterol fractions; 4-desmethyl-, 4-monomethyl-, and 4,4-dimethylsterol, separated by thin layer chromatography from the unsaponifiables of five Cucurbitaceae (cucumber, watermelon, sponge cucumber, gourd and snake gourd) seed oils were analyzed by gas liquid chromatography and combined gas liquid chromatography-mass spectrometry.
-stigmastadienol isolated from the 4-desmethylsterol fraction were identified by IR, NMR and mass spectrometry.
The Physical and Catalytic Properties of Kuryongpo Natural Zeolite
Chong Sik Chung ; Gon Seo ; Hakze Chon ; Hoagy Kim ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 204~209
The properties of the natural zeolite produced in Kuryongpo, Kyungsang-Bukdo, were investigated by X-ray diffraction analysis, chemical composition analysis, and nitrogen adsorption experiment. The quality of the acid treated natural zeolite as the catalyst for the disproportionation reaction of toluene was examined experimentally by observing the conversion in a microcatalytic reactor. The quantitative analysis and X-ray diffraction spectrum showed that the zeolite ore of Kuryongpo contained approximately 30 to 40 percent of mordenite structure. The surface area of the zeolite ore was
/gm and increased to a maximum value of
/gm after treatment with 2 N HCl solution. The catalytic activity for the toluene disproportionation reaction was maximum when the zeolite treated with 2 N HCl solution was used. The selectivity of xylene to benzene decreased with increasing degree of acid treatment.
Studies on the Chemical Composition of Korean Wheat Flour Proteins (I). Purification of Gliadin Proteins and Amino Acid Composition
Sung Hye Cho ; Kim Jun Pyong ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 210~214
We have investigated the amino acid composition of gliadin and glutenin from wheat flour Jang Kwang variety and have purified the main gliadin protein by Sephadex column. The results were obtained as follows: 1. Five bands of component for both gliadin and glutenin were found in disc electrophoretic gel column 2. The highest content of amino acid in gliadin and glutenin were glutamic acid and alanine was present in comparatively large amounts in glutenin, whereas proline was rich in gliadin 3. Main gliadin protein was purified by Sephadex G-150 and A-25 column chromatography and identified its purity by disc electrophoresis.
Studies on the Chemical Composition of Korean Wheat Flour Proteins (II). Molecular Weight of the Main Gliadin Protein and Its Terminal Amino Acid Determination
Sung Hye Cho ; Jun Pyong Kim ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 215~218
We have investigated for amino acid composition, molecular weight and terminal amino acid of the main gliadin protein which was purified by Sephadex column. The results were obtained as follows: 1. The highest content of amino acid was glutamic acid for the main gliadin protein. 2. The molecular weight was estimated 60,200
200 for the main gliadin protein. 3. Identified N-terminal and C-terminal amino acid of the main gliadin protein were phenylalanine and methionine, respectively.
Copolymerization of Bis(
-chloroethyl)vinylphosphonate and vinyl Acetate
Jung-Il Jin ; Hoe-Sup Byun ; Park Yoo-Mi ;
Journal of the Korean Chemical Society, volume 21, issue 3, 1977, Pages 219~224
The free radical initiated copolymerization of vinyl acetate (VAc) and bis(
-chloroethyl)vinylphosphonate (BCVP) was studied. The monomer reactivity ratios for the monomer pair determined at
using benzoyl peroxide as an initiator are:
The values of Alfrey-Price's Q and e for the bis(
-chloroethyl)vinylphosphonate were calculated to be 0.06 and 1.1, respectively. The statistical analyses for the monomer sequence distribution and the mean sequence length show that the copolymer formed from these two monomers are of fairly alternating tendency. Differential thermal analysis showed that thermal stability of the copolymers decreases as the content of BCVP in the copolymer increases.