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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Chemical Society
Journal Basic Information
Journal DOI :
Korean Chemical Society
Editor in Chief :
Volume & Issues
Volume 19, Issue 6 - Dec 1975
Volume 19, Issue 5 - Oct 1975
Volume 19, Issue 4 - Aug 1975
Volume 19, Issue 3 - Jun 1975
Volume 19, Issue 2 - Apr 1975
Volume 19, Issue 1 - Feb 1975
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Partial Molal Volume and Viscosity of Tetraethylammonium Chloride in Dimethyl Sulfoxide-Water Mixtures
Cho Byung Rin ; Lee Yong Ja ; Lee Ikchoon ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 3~10
The partial molal volumes and relative viscosities of tetraethylammonium chloride in a series of dimethyl sulfoxide (DMSO)-water mixtures were measured at
. A maximum structuredness of solvent, that leads to a minimum viscosity A-coefficient and a maximum viscosity B-coefficient of the Jones-Dole equation(
+ BC), was found at 0.2
0.3 mole fraction of DMSO. The solvent structure, that leads to a minimum partial molal volume due to the maximum electrostrictive effect of chloride ion and to a minimum viscosity B-coefficient, was found at 0.4
0.5 mole fraction of DMSO. An approximate relationship between the limiting effective flowing volume,
, and the B-coefficient was found to be B = 2.5
in the Einstein equation.
Nucleophilic Substitution at a Carbonyl Carbon Atom (V). Kinetic Studies on Halogen Exchange Reactions of N,N-Dialkylcarbamoyl Chlorides in Dry Acetone
Kim Shi Choon ; Lee, Ik Choon ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 11~15
Kinetic study of halogen exchange for N,N-dimethylcarbamoyl chloride and N,N-diethylcarbamoyl chloride in acetone by using radioisotopic halide ions has been carried out at two temperatures as a part of studying the reactivity of carbonyl carbon atom. The order of nucleophilicity showed a similar tendency as that for alkyl chloroformate, but reaction rate is much slower than that for solvolysis and alkyl chloroformate. The activation parameters,
were found to decrease in sequence
for N,N-dialkylcarbamoyl chlorides. The results are interpreted in terms of solvation effect, degree of bond-breaking and bond-formation and electronic requirements.
3-Molybdo-9-tungstophosphoric Acid, 6-Molybdo-6-tungstophosphoric Acid and Their Reduction Products
Im Kyoung Ran ; Yoon Minjoong ; So Hyunsoo ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 16~20
3-Molybdo-9-tungstophosphoric acid, 6-molybdo-6-tungstophosphoric acid and their one-electron and two-electron reduction products have been synthesized. Infrared spectra show that all of them have Keggin structure. Polarograms and optical spectra of the reduced species are reported. Both data indicate that each additional electron is localized on a molybdenum atom.
Structural Studies on Conjugated Oximes (I). The Syntheses of 2-Butenedialdioximes, and the Conformational Study of their cis-Isomer by NMR
Hong Young-Suek ; Lee Hak-Ki ; Park Byung Kack ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 21~33
cis-and trans-2-butenedialdioximes are synthesized via 2-butenedials, very unstable precursors, and the conformation of the cis-isomer of those compounds is determined by the NMR spectra of 1,4-dideutero-and 1-deutero-cis-2-butenedialdioximes; it is certain that the conformation has an unsymmetrical structure as shown below.
Studies on the Carotenoid Pigment in Abdominal Skin of Bombina Orientalis (Ⅲ). Occurrence of 3-Hydroxy-canthaxanthin in the Abdominal Skin of Bombina Orientalis
Chang Sae Hee ; Chong Ui Chun ; Choi Il Young ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 34~37
3-Hydroxy-canthaxanthin, reddish purple needle shaped crystals, has been isolated from the abdominal skin of Bombina Orientalis. Its structure has been established by visible and IR spectral characteristics, chromatographic behaviors, and physical and chemical properties.
Synthesis of Chloral-2-acetothienone and Trichloroethylidene-2-acetothienone, and Reaction of Trichloroethylidene-2-acetothienone with Hydrazines
Lee, Hyo Won ; Lee, Youn Young ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 38~42
Chloral-2-acetothienone was synthesized from the condensation of 2-acetothienone with chloral, and trichloroethylidene-2-acetothienone was obtained from the dehydration of chloral-2-acetothienone. From the reaction of trichloroethylidene-2-acetothienone with phenylhydrazine or substituted phenylhydrazines 2-aryl-6-(2-thienyl)-3(2H)-pyridazinones were obtained. 3-(2-Thienyl)-5-trichloromethyl-2-pyrazoline was synthesized from the reaction of trichloroethylidene-2-acetothienone with hydrazine hydrate.
Chemical Reactivity of N-Iodopyridinium Dichlorodate as a Lubricant Additive
Moon Tak Jin ; Kwon Oh Seung ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 43~49
Small amounts of iodine compound in mineral oils are usually effective in reducing friction of metallic surfaces. Such improvement in frictional behaviour of wear characteristics was explained by the formation of a diiodide layer lattice structure at the metallic contact surfaces. The lubrication mechanism, however, by which organoiodine compounds functions is not based on the formation of such lattice structure iodide. It was tested and shown, by a static surface chemical reactivity test, wear and EP tests, and a hot wire method, that compound such as N-iodopyridinium dichlorodate, a double charge transfer complex, reacted with metals as an interhalogen compound and that the resultant thin film product reduced appreciable the friction of metallic surfaces, more than compounds such as methyl iodide, diiodomethane, and iodoform. These results suggest that the action of iodine, included in organoiodine compounds, is not that of a classical layer structure iodide, and an entirely new mechanism may be derived from a further studies on charge transfer complex compounds of organoiodine compounds.
Oxidation Stability of Regenerated Lubricating Oils (II) Formation of anti-Oxidant Materials
Nah Yun Ho ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 50~52
The oxidation stability of samples prepared by blending samples reported previously with diesel oil and diesel oil with additives(alkyl benzene and phenolic type of materials), was tested to study the mechanism of thermal oxidation stability of the regenerated lubricating oils. It was found that the improvement of thermal oxidation stability of such oils was caused by the formation of aromatic compounds, especially phenolic type of organic materials.
Polymerization of Vinyl Monomers Initiated by Cobalt (II) Chloride
Lee Dong-ho ; Ahn Tae-oan ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 53~64
The polymerization of methyl methacrylate initiated by cobalt(II) chloride in tetrahydrofuran has been studied. The conversion was increased liearly with polymerization time at initial stage of 6
7% conversion and then the rate of polymerization was slightly reduced, and after that the autoacceleration was observed. The rate of polymerization was increased with the concentration of cobalt(Ⅱ) chloride, but at the concentration of cobalt(II) chloride higher than
mole/l the rate of polymerization was decreased. The rate of polymerization was dependent on the 1.38 power of the concentration of methyl methacrylate. The effect of the radical inhibitor DPPH was observed and the inhibition time was increased with the concentration of DPPH. The apparent overall activation energy was calculated to be 13.2 kcal/mole. In the copolymerization of methyl methacrylate (
) and styrene (
), the monomer reactivity ratio was found to be
= 0.78. From the above results. the initiation mechanism of polymerization was discussed and it was considered that the polymerization proceeds mainly via diradical mechaism.
Studies on the Characteristics of Humic Acid and Its Utilization (V). Manufacturing of Sulfur-dyes from Humic Acid
Han Kyoungsuk ; Kim Wontaik ;
Journal of the Korean Chemical Society, volume 19, issue 1, 1975, Pages 65~70
Sulfur-dyes were manufactured from humic acid,
and other additives at
for 3∼20 hrs. Sulfur-dyes from humic acid were fundamentally brown colors and could be changed from yellowish to grayish brown according to the additives. The colorfastness to rubbing and laundering were excellent but to weather was fair. Characteristic bonds of sulfur-dyes such as -C-S-C, -C-SO-C-. -C-
-C-, and -C-O-
-O-C- were confirmed but thiazole bond and thiazine ring were not done by IR-spectroscopy.