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Trapping of the Dichlorocarbonyl Oxide Using a Chiral (Salen)Mn(Ⅲ) Complex
Baik, Jong Seok,Han, Sung-bin,Lee, Nam Ho 濟州大學校 基礎科學硏究所 1997 基礎科學硏究 Vol.10 No.1
Carbonyl oxides 1 have long been established as key intermidiates in the ozonolusis of olefins. These oxides are also known to be generated by treatment of oxygen to the carbene species. The intermediacy of 1has been extensively characterized in terms of direct spectroscopic observation as well as theoretical calculation. Much attention has been devoted to study the reaction of the elusive intermediate 1, including the cycloaddition with carbon1 compounds to give trioxolane adducts. In addition, they may transfer an oxygen atom to organic substrates such as alkanes, alkenes, arenes, and sulfoxides.
A Computational Investigation of the Stability of Cyclopropyl Carbenes
Baik, Woon-Phil,Yoon, Cheol-Hun,Koo, Sang-Ho,Kim, Byeong-Hyo Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.1
The conformations of dicyclopropyl, isopropyl cyclopropyl, and diisopropylcarbenes were optimized using density functional theory (B3LYP/6-31G(d)). We showed that the optimized geometries of carbenes with cyclopropyl groups are fully in accord with those expected for bisected W-shaped conformations, in which the effective hyperconjugation of a cyclopropyl group with singlet carbene can occur. The stabilization energies were evaluated at the B3LYP/6-311+G(3df, 2p)//B3LYP/6-31G(d) + ZPE level using an isodesmic equation. The relative stability of carbenes is in the order $(c-Pr)_2$C: > (i-Pr)(c-Pr)C: > $(i-Pr)_2$C:, and a cyclopropyl group stabilizes carbene more than an isopropyl group by nearly 9 kcal/mol. Energies for the decomposition of diazo compounds to carbenes increase in the order $(c-Pr)_2$ < (i-Pr)(c-Pr) < $(i-Pr)_2$ by ~9 kcal/mol each. From a singlettriplet energy gap ($E_{ST}$) calculation, the singlet level is lower than the triplet level and the $E_{ST}$ shows a trend similar to the stabilization energy calculations. For comparison, the optimized geometries and stabilization energies for the corresponding carbocations were also studied at the same level of calculation. The greater changes in geometries and the higher stabilization energies for carbocations compared to carbenes can explain the greater hyperconjugation effect.
Morphological and Molecular Classifications of Genus Pholis
Sung-Hoon Lee,장요순,Chung-Boo Baik,Kyeong-Ho Han,Jung-Goo Myung,Jin-Hee Lee,Sang-Duk Choi,Seon-Jae Kim,김종오,황재호 한국통합생물학회 2009 Animal cells and systems Vol.13 No.4
Morphological and molecular classifications were attempted in an effort to establish species-specific classifications of three species of the genus Pholis in Korea; these species were subjected to morphological and molecular methodologies using body measurements, RFLP, RAPD, and phylogenetic trees using the nucleotide sequences of mitochondrial 16S and 12S ribosomal DNAs, cytochrome c oxidase I, and cytochrome b. The data demonstrated that the three species of genus Pholis are distinct from each other, both morphologically and genetically.
Ho-Sup Kim,Sang-Soo Oh,Nam-Jin Lee,Seung-Kyu Baik,Dong-Woo Ha,Rock-Kil Ko,Hong-Soo Ha,Tae-Hyung Kim,Do-Jun Youm,Seung-Hyun Moon,Chan Park IEEE 2010 IEEE transactions on applied superconductivity Vol.20 No.3
<P>The Hall probe measurement system was used to measure the critical current distribution of superconducting coated conductor. The system consists of reel to reel moving apparatus, 7 array Hall probe, a rotary encoder and permanent magnet. The magnetic field profile across the width of superconducting coated conductor using Bean's critical state model was calculated. The effect of various parameters of the formulas on the magnetic field distribution and the effect of shape and size of artificial defects, which were formed on the surface of SmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-d</SUB>(SmBCO) coated conductor using laser marking system, on the Hall probe magnetic field signal of the Hall probe measurement system was investigated.</P>
Baik, Woon-Phil,Yoon, Cheol-Hoon,Koo, Sang-Ho,Kim, Ha-Kwon,Kim, Ji-Han,Kim, Jeong-Ryul,Hong, Soo-Dong Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.4
The Lewis acid-catalyzed reactions of anthrone with a variety of ethylenic substrates under various conditions have been studied. It has been observed that depending on kinds of ethylenic substrates and catalysts, products were varied. In particular, the $ZnCl_2$-catalyzed reaction of anthrone with ${\alpha},{\beta}$ -unsaturated ester gave bridged compounds 3 (Diels-Alder adduct type) and mono-Michael adduct 4 exclusively, while the base-catalyzed reaction gave 10,10-bis-Michael adduct as a major product independent of the amount of ethylenic substrate and base. Bridged compounds 3 were easily converted to the corresponding mono-Michael adduct 4 by a catalytic amount of base. Further Michael reaction of mono-Michael adducts with different ethylenic substrates in the presence of a catalytic amount of alkoxide gave unsymmetrical 10,10-bis Michael adducts in good or moderate yields.