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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 2, Issue 4 - Dec 1981
Volume 2, Issue 3 - Sep 1981
Volume 2, Issue 2 - Jun 1981
Volume 2, Issue 1 - Mar 1981
Selecting the target year
Synthesis of Nucleophilic Adducts of Thiols (Ⅰ). Addition of Cysteine to
Kim, Tae-Rin ; Choi, Sung-Yong ;
Bulletin of the Korean Chemical Society, volume 2, issue 4, 1981, Pages 125~129
The addition reactions of cysteine without blocking amino and carboxyl groups to substituted and unsubstituted
-nitro-styrene derivatives were investigated.
-nitrostyrene(1d), o-, m- and p-chloro-
-nitrostyrene (1e, 1f, 1g) and o-, m- and p-methoxy-
-nitrostyrene (1h, 1i, 1j) easily undergo addition reactions with cysteine to form S-(2-nitro-1-phenylethyl)-L-cysteine(3a), S-[2-nitro-1-(p-methyl)phenyl-ethyl]-L-cysteine(3b), S-[2-nitro-1-(3',4',5'-trimethoxy) phenylethyl]-L-cysteine(3c), S-[2-nitro-1-(
-3',4'-methylenedioxy)phenylethyl]-L-cysteine(3d), S-[2-nitro-1-(o-chloro)phenylethyl]-L-cysteine(3e), S-[2-nitro-1-(m-chloro)-phenylethyl]-L-cysteine(3f), S-[2-nitro-1-(p-chloro)phenylethyl]-L-cysteine(3g), S-[2-nitro-1-(o-methoxy)phenylethyl]-L-cysteine(3h), S-[2-nitro-1-(m-methoxy)phenylethyl]-L-cysteine(3i) and S-[2-nitro-1-(p-methoxy)phenylethyl]-L-cysteine(3j), respectively. The structure of adducts were confirmed by means of UV-spectrum, IR-spectrum, molecular weight measurement and elemental analysis. The various factors effecting the yield of cysteine adducts to
-nitrostyrene derivatives were also studied.
Rheological Properties of Polystyrene Degraded by Mechanical Forces
Oh, In-Joon ; Ree, Taik-Yue ;
Bulletin of the Korean Chemical Society, volume 2, issue 4, 1981, Pages 129~132
Polystyrene was degraded by using a vibrating ball mill. The viscosities and molecular weights of the degraded products were measured, and the decrease of viscosity
(rate of shear) observed for the degraded products were analyzed by applying the Ree-Eyring equation for viscous flow. The variation of the parameters
in the equation were explained by the fracture of polymer molecules by mechanical force. The electron paramagnetic resonance spectrum of the degraded sample was taken, and it was confirmed that free radicals were produced by the chain-scission of polystyrene.
Determination of Reactivity by MO Theory (XX). An MO Theoretical Study on Mechanism of Thiocarbonyl Addition.
Lee, IK-Choon ; Yang, Ki-Yull ;
Bulletin of the Korean Chemical Society, volume 2, issue 4, 1981, Pages 132~138
Ab initio molecular orbital calculations have been performed in an effort to determine which types of chemical interactions play essential roles for the system,
. The most important contribution to the interaction energy in controlling reaction path is the exchange repulsion energy, EX, which is largely responsible for the shape of the total interaction energy curve. In the ion-molecule reaction, prior protonation of thioformaldehyde or prior deprotonation of water leads to formation of the corresponding ionic adducts (
), with no barrier to reaction, simulating specific acid and base catalysis, respectively, as in the case of formaldehyde. Otherwise, approach of water to thioformaldehyde gives rise to a completely repulsive interaction.
Kinetics of the Bromine-Exchange Reaction of Gallium Bromide with i-Butyl Bromide in 1,2,4,-Trichlorobenzene and in Nitrobenzene
Kwun, Oh-Cheun ; Kim, Young-Cheul ; Choi, Sang-Up ;
Bulletin of the Korean Chemical Society, volume 2, issue 4, 1981, Pages 138~141
The rate of the bromine-exchange reaction between gallium bromide and i-butyl bromide in 1,2,4-trichlorobenzene or nitrobenzene was measured at 19, 25 and
, using i-butyl bromide labelled with Br-82. The results indicated that the exchange reaction was second order with respect to gallium bromide and first order with respect to i-butyl bromide. The third-order rate constant determined at
in 1,2,4-trichlorobenzene and
in nitrobenzene. The activation energy, the enthalpy of activation and the entropy of activation for the exchange reaction were also determined.
Rheological Properties of the Solutions of Incompatible Polymer Blends
Sohn, Jeong-In ; Ree, Taik-Yue ;
Bulletin of the Korean Chemical Society, volume 2, issue 4, 1981, Pages 142~147
A blend polymeric system composed of poly(methyl methacrylate) (PMMA or PM) and polystyrene (PS) dissolved in chloroform was rheologically studied. The viscosities
of the blend system with various blending ratios
changing from zero (pure PS solution) to unity (pure PMMA solution) were measured at
as a function of shear rates
by using a Couette type viscometer.
at a given
decreased exponentially with
reaching asymptotic constant value of
at a given
is greater at a smaller
. These results are explained by using Ree-Erying's theory of viscosity,
. The Gibbs activation energy
(i = 2 for non-Newtonian units) entering into the intrinsic relaxation time
is represented by a linear combination
;the intrinsic shear modulus
is also represented by
and the fraction of area on a shear surface occupied by the ith flow units
is similarly represented, i.e.,
. By using these ideas the Ree-Eyring equation was rewritten which explained the experimental results satisfactorily.
The Linear Free Energy Relationship in Cinnamonitrile Derivatives
Shim, Sang-Chul ; Yoon, Suk-Kyoon ;
Bulletin of the Korean Chemical Society, volume 2, issue 4, 1981, Pages 147~151
Chemical shift differences of vinyl protons of cis- and trans-cinnamonitrile derivatives are very well correlated with
, and (F, R) (r = 0.9996-0.8946), much better correlation than the case of methyl cinnamates. para-Substituted and trans-cinnamonitrile derivatives have larger resonance contribution than meta-substituted and cis-derivatives.
Model Studies in Photosynthesis (I). Synthesis and Characterization of Some Novel Pyropheophorbide Derivatives
Lee, Eun ; Chang, Won-Ghil ; Park, Sang-Chul ; Park, Sang-Kyu ; Kim, Hong-Doo ; Lee, Jo-Woong ;
Bulletin of the Korean Chemical Society, volume 2, issue 4, 1981, Pages 152~157
2'-(9"-Anthracenecarbonyloxy)ethyl pyropheophorbide a, methyl 3a-(9'-anthracenecarbonyloxy)pyropheophorbide a, 2'-(4"-phenylbenzoyloxy)ethyl pyropheophorbide a, and methyl 3a-(4'-phenylbenzoyloxy)pyropheophorbide a were prepared from chlorophyll a and b. Nuclear magnetic resonance study showed that the sandwich conformation is more favorable in 2'-(9"-anthracenecarbonyloxy)ethyl pyropheophorbide a than it is in other compounds.