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2-Thienyl chalcone 유도체에 대한 Thioglycolic acid의 친핵성 첨가반응 연구
공승대,황성규,이기창,최상회,오세영 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-
The Addition reaction kinetics of 2-Thienyl chalone derivatives[][] was investigated by ultraviolet spectrophotometery in 20% dioxane-H2O at 25. The structure of these compounds were ascertained by means of ultraviolet, melting point,IR and NMR spectra. The final product was 2-thienyl chalcone-thioglycolic acid synthesized by the addition of thioglycolic acid for the 2-thienyl chalcone. The rate equations which were applied over a wide pH range(pH 1.013.0) were obtained. The substituent effects on 2-thienyl chalcone derivatives[][] were studied, and the addition reaction were facilitated by electron attracting groups. On the basis of the rate equation and substitutent effect and general base effect,the plausible addition reaction mechanism was proposed : Below pH 9.0, neutral H2O molecule and thioglycolic acid anion competitively attacked on the double bond. Above pH 9.0, It was proportional to concentration of hydroxideion.
Sulfa 제의 Dual Action에 의한 지속성과 항균성
공승대(Seung Dae Kong),황성규(Sung Kwy Hwang),윤철훈(Cheol Hun Yoon),김진영(Jin Yeong Kim),이한섭(Han Seob Lee) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.4
N/A Dual-actions are the most recently used delivery system in drug study. Dual-action agents are unique chemical entities comprised of two different type of antibacterial compounds covalently linked together in a single molecule in such a way that both components are able to exert their bactericidal properties. Crosslinked sulfadiazine-sulfanilamide such as antibiotics is synthesized by synthetic handle with glutaraldehyde. As a result, New synthetic antibacterial agent exhibited the broad antibacterial activities against gram(+) and gram(-) of 4 strains and a long durability supposing that the stomach and blood.