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PVS 유도체에 대한 L-Cysteine 의 친핵성 첨가반응에 관한 연구
이기창,이광일,윤철훈,황성규,공승대 ( Ki Chang Lee,Kwang Iil Lee,Chul Hun Yoon,Sung Kwy Hwang,Seung Dae Kong ) 한국유화학회 1995 한국응용과학기술학회지 Vol.12 No.2
Phenylvinylsulfone derivatives were synthesized by Kirners condition. The structure of these compounds were ascertained by means of ultraviolet, melting point, IR and ^1H-NMR spectra. The nucleophilic addtion reaction kinetics of L-cysteiene for phenylvinylsulfone was investigated by ultraviolet spectrophotlmetery in 40% EtOH-H_2O at 25℃. The rate equations which were applied over a wide pH 1.0~13.0 range. On the basis of general base catalysis and confirmation of addtion reaction product, the nucleophilic addtion reaction kinetics of L-cysteiene for phenylvinylsulfone were measured by the pH change. From the result of the above caption, a plausible nucleophilic addtion reaction mechanism of L-cysteiene for phenylvinylsulfone was proposed. These compounds may by used ad the starting materials for the preparation of the engineering plastics or the germicide.
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.