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Bulletin of the Korean Chemical Society 38건

  1. [국내논문]   Formation of Thermoresponsive Surfaces by Surface-Initiated, Aqueous Atom-Transfer Radical Polymerization of N-Isopropylacrylamide: Application to Cell Culture   피인용횟수: 3

    Kim, Dong-Jin (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) ) , Kong, Bok-Yung (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) ) , Jung, Young-Hwan (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) ) , Kim, Kwang-Soo (Tego Science, Daerugn Technotown ) , Kim, Wan-Joong (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) ) , Lee, Kyung-Bok (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) ) , Kang, Sung-Min (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) ) , Jeon, Sae-Wha (Tego Science, Daerugn Technotown ) , Choi, In-Sung S. (Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST))
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1629 - 1630 , 2004 , 0253-2964 ,

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  2. [국내논문]   C-C Bond Formation at C-5 Position of Dimethyluracil Derivatives Using SmI2  

    Youn, So-Won (Department of Chemistry, Pukyong National Unviersity)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1631 - 1632 , 2004 , 0253-2964 ,

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  3. [국내논문]   Mild and Efficient Deoxygenation of Amine-N-Oxides with FeCl3·6H2O-Indium System under Ultrasonication  

    Yoo, Byung-Woo (Department of Advanced Materials Chemistry, Korea University ) , Hwang, Sun-Kyun (Department of Advanced Materials Chemistry, Korea University ) , Kim, Dong-Yoon (Department of Advanced Materials Chemistry, Korea University ) , Choi, Jin-Woo (Department of Advanced Materials Chemistry, Korea University ) , Kang, Sang-Ook (Department of Advanced Materials Chemistry, Korea University ) , Yoo, Byoung-Seung (Department of Food Science and Technology, Dongguk University ) , Choi, Kyung-Il (Biochemicals Research Center, Korea Institute of Science and Technology ) , Kim, Joong-Hyup (Biochemicals Research Center, Korea Institute of Science and Technology)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1633 - 1634 , 2004 , 0253-2964 ,

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  4. [국내논문]   Synthesis and Guest Binding Properties of Cyclophanes Containing Two Benzo[b]furan Rings  

    Park, Kwang-Hee (Department of Chemistry, Chungnam National University ) , Kim, Sun-Hyuk (Department of Chemistry, Chungnam National University ) , Park, Joon-Woo (Department of Chemistry, Ewha Womans University)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1635 - 1640 , 2004 , 0253-2964 ,

    초록

    The cyclophanes 1a-d containing two benzo[b]furan rings connected by various bridges have been prepared and their binding behaviors with N-benzylphenethylammonium cation 2 were examined by NMR titration method. The successive alkylation reactions of 4-hydroxyl groups and then 2-hydroxyl groups of 2,4-dihydroxybenzophenonse gave macrocycles 5a-c. Photoirradiation of the macrocycles 5a-c with 350 nm mercury lamp followed by dehydration afforded the cyclophanes 1a-c. Hydrolysis of two ester groups pendant on a bridge of 1b produced the carboxyl group-containing cyclophane 1d. The cyclophane 1a having a p-xylene bridge showed 1 : 1 binding with 2 with the binding constant of $36{\pm}6M^{-1}$ in 3 : 1 $CDCl_3$ /methanol- $d_4$ solvent, while 1b and 1c which have neutral flexible bridges exhibited no appreciable binding with 2. The disodium salt of 1d showed much higher binding affinity for 2 forming 1 : 1 and 1 : 2 complexes.

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  5. [국내논문]   Synthesis and Shuttling Behavior of Rotaxanes Consisting of Crown Ether Wheel and Disulfide Dumbbell with Two Ammonium Centers  

    Furusho, Yoshio (Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University ) , Sanno, Ryoko (Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University ) , Oku, Tomoya (Department of Organic and Polymeric Materials, Tokyo Institute of Technology ) , Takata, Toshikazu (Department of Organic and Polymeric Materials, Tokyo Institute of Technology)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1641 - 1644 , 2004 , 0253-2964 ,

    초록

    Several [2]- and [3]rotaxanes bearing some functional groups on their wheel components and spacers with different lengths between two ammonium centers on their dumbbell components were prepared in good yields from dibenzo-24-crown-8-ether derivatives and dumbbell-shaped bis(sec-ammonium salt)s having a centrally located disulfide linkage, by utilizing the reversible thiol-disulfide interchange reaction. The shuttling behaviors of the [2]rotaxanes were investigated by $^1H$ NMR by use of the spin polarization transfer-selective inversion recovery technique. It was found that the change in spacer length in the axle resulted in a drastic change in shuttling rate of the [2]rotaxanes, although the introduction of the functional groups to the wheels did not affect the shuttling behavior at all.

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  6. [국내논문]   Potential Energy Surfaces for the Reaction Al + O2→ AlO + O   피인용횟수: 2

    Ledentu, Vincent (Chimie Theorique, Universite de Provence ) , Rahmouni, Ali (Laboratoire de Modelisation et Methodes de Calcul, Centre Universitaire Dr Moulay Tahar ) , Jeung, Gwang-Hi (Chimie Theorique, Universite de Provence ) , Lee, Yoon-Sup (Department of Chemistry and School of Molecular Sciences (BK21), Korea Advanced Institute of Science and Technology)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1645 - 1647 , 2004 , 0253-2964 ,

    초록

    Potential energy surfaces for the reaction Al + $O_2{\to}$ AlO + O have been calculated with the multireference configuration interaction (MRCI) method using molecular orbitals derived from the complete active space selfconsistent field (CASSCF) calculations. The end-on geometry is the most favourable for the reaction to take place. The small reaction barrier in the present calculation (0.11 eV) is probably an artefact related to the ionicneutral avoided crossing. The charge analysis implies that the title oxidation reaction occurs through a harpooning mechanism. Along the potential energy surface of the reaction, there are two stable intermediates of $AlO_2(C_{{\infty}v}$ and $C_{2v}$ ) at least 2.74 eV below the energy of reactants. The calculated enthalpy of the reaction (-0.07 eV) is in excellent agreement with the experimental value (-0.155 eV) in part due to the fortuitous cancellation of errors in AlO and $O_2$ calculations.

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  7. [국내논문]   Syndiotactic Polymerization of Amino-functionalized Styrenes Using (Pentamethylcyclopentadienyl)titanatrane/MMAO Catalyst System   피인용횟수: 2

    Kim, Young-Jo (Performance Polymers Research Institute, LG Chem., Ltd. ) , Park, Sung-Jin (Department of Chemistry, School of Molecular Science-BK21 and Center for Molecular Design and Synthesis, Korea Advanced Institute of Science and Technology ) , Han, Yong-Gyu (Department of Chemistry, School of Molecular Science-BK21 and Center for Molecular Design and Synthesis, Korea Advanced Institute of Science and Technology ) , Do, Young-Kyu (Department of Chemistry, School of Molecular Science-BK21 and Center for Molecular Design and Synthesis, Korea Advanced Institute of Science and Technology)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1648 - 1652 , 2004 , 0253-2964 ,

    초록

    A set of unprecedented syndiospecific dimethyl- and diethylamino-functionalized polystyrenes was prepared by catalytically polymerizing the corresponding monomers using (pentamethylcyclopentadienyl)titanatrane/MMAO catalytic system. Dialkylamino-functionalized styrene monomers were synthesized by Wittig reaction from the corresponding aldehyde in high yield. The resulting polymers are soluble in polar organic solvents such as THF and show good thermal stability. The chemical transformation of the syndiospecific poly(4-diethylaminostyrene) also gave new polar polymers, namely syndiotactic poly(4-diethylaminostyrene hydrochloride), which is unattainable by traditional synthetic methods.

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  8. [국내논문]   Concomitant Addition and Acetalization of α,β-Unsaturated Aldehydes with Diols  

    Jeon, Kyu-Ok (Department of Chemistry, Kangwon National University ) , Yu, Ji-Sook (Department of Chemistry, Kangwon National University ) , Lee, Chang-Kiu (Department of Chemistry, Kangwon National University)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1653 - 1656 , 2004 , 0253-2964 ,

    초록

    ${\alpha},{\beta}$ -Unsaturated aldehydes such as acrolein and crotonaldehyde were reacted with diols in the presence of conc. sulfuric acid to give products of which concomitant addition to C-C double bond and acetalization took place. Boron trifluoride etherate and titanium tetrachloride gave only acetalization products.

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  9. [국내논문]   The Rearrangement Reaction of CH3SNO2 to CH3SONO Studied by a Density Functional Theory Method   피인용횟수: 1

    Choi, Yoon-Jeong (Department of Chemistry, and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology ) , Lee, Yoon-Sup (Department of Chemistry, and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1657 - 1660 , 2004 , 0253-2964 ,

    초록

    Several critical geometries associated with the rearrangement of $CH_3SNO_2\;to\;CH_3SONO$ are calculated with the density functional theory (DFT) method and compared with those of the ab initio molecular orbital methods. There are two probable pathways for this rearrangement, one involving the transition state of an oxygen migration and the other through the homolytic decomposition to radicals. The reaction barrier via the transition state is about 60 kcal/mol and the decomposition energy into radicals about 35 kcal/mol, suggesting that the reaction pathway via the homolytic cleavage to radical species is energetically favorable. Since even the homolytic cleavage requires large energies, the rearrangement reaction is unlikely without the aid of catalysts.

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  10. [국내논문]   Preparation of Anatase TiO2 Thin Films with (OiPr)2Ti(CH3COCHCONEt2)2 Precursor by MOCVD   피인용횟수: 2

    Bae, Byoung-Jae (National Research Laboratory, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology ) , Lee, Kwang-Yeol (Department of Chemistry, Korea University ) , Seo, Won-Seok (National Research Laboratory, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology ) , Miah, Md. Arzu (National Research Laboratory, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology ) , Kim, Keun-Chong (Department of Management Information System, College of Business Management, Hong-Ik University ) , Park, Joon T. (National Research Laboratory, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology)
    Bulletin of the Korean Chemical Society v.25 no.11 ,pp. 1661 - 1666 , 2004 , 0253-2964 ,

    초록

    The reaction of titanium tetraisopropoxide with 2 equiv of N,N-diethyl acetoacetamide affords Ti( $O^iPr)_2(CH_3COCHCONEt_2)_2$ (1) as colorless crystals in 80% yield. Compound 1 is characterized by spectroscopic (Mass and $^1H/^{13}C$ NMR) and microanalytical data. Molecular structure of 1 has been determined by a single crystal X-ray diffraction study, which reveals that it is a monomeric, cis-diisopropoxide and contains a six coordinate Ti(IV) atom with a cis( $CONEt_2$ ), trans( $COCH_3$ ) configuration (1a) in a distorted octahedral environment. Variable-temperature $^1H$ NMR spectra of 1 indicate that it exists as an equilibrium mixture of cis, trans (1a) and cis, cis (1b) isomers in a 0.57 : 0.43 ratio at -20 $^{\circ}C$ in toluene- $d_8$ solution. Thermal properties of 1 as a MOCVD precursor for titanium dioxide films have been evaluated by thermal gravimetric analysis and vapor pressure measurement. Thin films of pure anatase titanium dioxide (after annealing above 500 $^{\circ}C$ under oxygen) have been grown on Si(100) with precursor 1 in the substrate temperature range of 350- 500 $^{\circ}$ using a bubbler-based MOCVD method.

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