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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 :
Byeong Moon Kim
Volume & Issues
Volume 15, Issue 6 - Dec 1971
Volume 15, Issue 5 - Oct 1971
Volume 15, Issue 4 - Aug 1971
Volume 15, Issue 3 - Jun 1971
Volume 15, Issue 2 - Apr 1971
Volume 15, Issue 1 - Feb 1971
Selecting the target year
Kinetics of the Solvolysis of Benzyl Bromides in Alcohols
Yong-Jin Lim ; Soo-Dong Yoh ; Soon-Yung Hong ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 219~222
The kinetics of the solvolysis of benzyl and p-or m-substituted benzyl bromides in various alcohols have been determined by an electric conductivity method. From these reactions, a curved Hammett plot is obtained and a mechanism is proposed to account for the nonlinear behavior observed. In addition, effects of solvent polarity on the activation parameters for the solvolysis of benzyl bromides are discussed.
Influence of Temperature on the Electrolytic Oxidation of Sulphate Solutions by Electro-deposited Lead Peroxide Anode
Chong Woo Nam ; Hak Joon Kim ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 223~228
In the electrolytic preparation of persulphate from sulphate solution, the current efficiency decrease with temperature increase at the platinum anode. But in case of electrodeposited lead peroxide anode, the current efficiency increase with temperature of the solution. The reason seems to be that the ozone formation is faster in platinum anode than in lead peroxide as temperature increase.
The Interaction of Gallium Bromide with n-Butyl Bromide in Nitrobenzene and in 1,2,4-Trichlorobenzene
Oh Cheun Kwun ; Yang Kil Kim ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 228~235
The solubilities of n-butyl bromide in nitrobenzene and in 1,2,4-trichlorobenzene have been measured at
in the presence and absence of gallium bromide. When gallium bromide does not exist in the system, the solubility of n-butyl bromide in nitrobenzene is greater than in 1,2,4-trichlorobenzene, indicating a stronger interaction of n-butyl bromide with nitrobenzene than with 1,2,4-trichlorobenzene. In the presence of gallium bromide, complex of n-butyl bromide with gallium bromide, 1:1 complex,
, is formed in the solution. The instability constant K of the complex was evaluated.
The changes of enthalpy, free energy and entropy for the dissociation of the complex were also calculated.
The Study of Analytical Chemistry of the Modification of Manganese Dioxide (Report one). The Study of
by Differential Heating Curves
Chan Ho Kim ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 236~241
Various modifications of manganese dioxide have been discussed in terms of the chemical analysis by differential heating curve. The transformation temperatures of the modifications were observed as follows;
, respectively. Endothermic peaks appeared at the transformation temperatures mentioned above. The restoration temperatures of transformation is completed depending on the amounts of the given samples, but the temperatures of the top of endothermic peaks are nearly constant. The curves of
show small peaks while that of
shows a sharp and broad peak.
The Study of Analytical Chemistry of the Modification of Manganese Dioxide (Report Two). Quantitative Determination of
-Manganese Dioxide by Differential Heating Curves
Chan Ho Kim ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 241~245
Endothermic peak of transformation of
was obviously shown by differential heating curve in the present study, and the transformation temperature was different from other modification.
carried out to analyze exclusively, by means of the half area method in corresponding endothermic peak of differential heating curve.
(Pyrolusite) containing in sample about 75% is interfered about
10% of the relative error, and while those of below 50% is interfered about
W rme-und Elektrische Leitfahigkeitsmessungen von Pyrokohlenstoff bei Hohen Temperaturen
B. Rhee ; H. Saihune ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 246~255
In der vorliegenden Arbeit wurde eine nach der von LLEWELLYN/HOPKINS entwickelten Direktheizmethode modifizierte Versuchsanlage konstruiert und zu Warme- und elektrische Leitfahigkeitsmessungen von Pyrokohlenstoff bei hohen Temperaturen verwendet. Die gemessenen Werte der Warme- und elektrischen Leitfahigkeit fur die bei der Abscheidung von Pyrokohlenstoff bei der Temperaturen von
erhaltenen Normal- und Spiralpyrokohlenstoff wurden mit den Literaturwerten des Hochregenerativpyrokohlenstoffes verglichen. Es wurden gefunden, da
der Spiralpyrokohlenstoff nicht nur eine bessere Warme- und elektrische Leitfahigkeit hat als der Normalpyrokohlenstoff, sondern auch er zu dem bei
abgeschiedenen Hochregenerativpyrokohlenstoff uberwiegend konkurrieren konnte.
An ESR Study of Amino Acid and Protein Free Radicals in Solution. Part IV. An ESR study of Gamma-Irradiated Amino Acids in Frozen Aqueous Solutions.
Sun-Joo Hong ; D. E. Holmes ; L. H. Piette. ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 256~265
An ESR study has been made on free radicals produced in frozen aqueous solutions (ices) of glycine, DL-
-alanine, DL-serine, L-cysteine, DL-leucine and DL-isoleucine by gamma-irradiation at dry ice temperature. All free radicals induced were decayed concomitant to the successive annealing but the radical species which is believed to be dominant seems to be stable even near the melting point of the ice. These dominant species were found to be identical to those resulted from direct action of radiation in the solid at room temperature. Small but significant changes in the spectra of glycine and DL-
-alanine were observed by varying the microwave power. These results seem to support the view that the spectra obtained were composite consisting of more than two different resonances having different power saturation characteristics. The relative contribution of unidentified resonances to the composite spectra was greater for solutions of low concentration. These resonances are assumed to be induced by indirect effects, mainly hydrogen abstraction by radiation produced hydroxyl radicals and also C-N bond cleavage by hydrated electrons.
Significant Structure Theory of Physical Adsorption
Yun-liang Wang ; Taikyue Ree ; Henry Eyring ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 265~274
A significant structure theory of monolayer physical adsorption is developed. The theory is tested with the adsorptions on graphite of gases Ar,
. A restricted rotation model is used for the polyatomic molecules
. The computed isotherms and heats of adsorption are in good agreement with experiment in all cases studied.
Synthesus of DL-1-Amino Alkyl Phosphonic Acids and Their Derivatives (II)
Kyung Yeon Cho ; Duck Chan Kim ; Yong Joon Kim ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 275~280
Six previously unreported N-acylated-DL-1-amino alkyl phosphonic acids were prepared; N-Acetyl-DL-1-amino-3-methyl butyl phosphonic acidN-Benzoyl-DL-1-amino-2-methyl propyl phosphonic acidN-Benzoyl-DL-1-amino-3-methyl butyl phosphonic acidN-Benzoyl-DL-1-amino-2-methyl butyl phosphonic acidN-Acetyl-DL-1-amino-2-methyl propyl phosphonic acidN-Acetyl-DL-1-amino-2-methyl butyl phosphonic acidThe first four compounds were characterized, and the last two compounds were obtained in the crude oil state. The above three DL-1-amino-alkyl phosphonic acid were synthesized from iso-valeric acid, iso-caproic acid and
-methyl valeric acid using Hell-Volhard-Zelinsky reaction, the condensation reaction with triethyl-phosphite and the modified Curtius Reaction. Iso-caproic acid and
-methyl valeric acid were prepared by the conventional methods.
Copolymerization of Glycidyl Methacrylate with Methyl Acrylate
Suck-Ju Hong ;
Journal of the Korean Chemical Society, volume 15, issue 5, 1971, Pages 281~284
Copolymerization of glycidyl methacrylate(GMA) with methyl acrylate(MA) and the reaction of the copoly mer with primary amines were investigated. The monomer reactivity ratios were determined by Mayo-Lewis intersecting method.
. GMA and MA copolymerized to afford the polymer having good alternate arrangements of the units of the monomers.