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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.
Furfurylidene acetophenone 유도체의 합성과 가수분해 반응
이기창,이광일,윤철훈,황성규,오세영 ( Ki Chang Lee,Kwang Il Lee,Cheol Hun Yoon,Sung kwy Hwang,Se Young Oh ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.1
Furfurylidene acetophenone derivatives were synthesis, it was measured that hydrolysis made use of UV at a wide pH 1.0~13.0 range in 30% dioxane-H_2O solution, 25±1℃. On the basis of general base catalysis, substitutent effect, confirmation of hydrolysis products, it was measured the reaction rate of furfurylidene acetophenone derivatives for the pH change. It maybe concluded that a part was unrelated to pH and another part was in proportion to concentration of hyfroxide ion : Above pH 10.0, It was in proportion to concentration of hydroxide ion, a part having no concern with pH was added to the neutral H_2O molecule. From the result of measurement the reaction rate, hydrolysis of furfurylidene acetophenone derivatver confirmed to the irreversible first order. Through measurement the substituent effect, It found that reaction rate was accelerated by electron attracting group. Also, From the result of final product, There were furfural and acetophenone derivative was proposed a fitting mechanism.
Oadiazole 유도체의 고리화 첨가반응에 의한 Pyrazole 유도체의 합성
이기창,황성규,이광일,최봉종 ( Ki Chang Lee,Sung Kwy Hwang,Kwang Ill Lee,Bong Jong Choi ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.1
The synthetic method of pyrazole was performed by 1,3-dipolar cycloaddition with dipolarophileinstead of the reaction between diazomethane and acetylene. The cycloaddition mechanism and reac-tivity of 3-phenyloxadiazole derivatives with dipolarophiles was investigated. In order to investigatethe mechanism and reactivity of this cycloaddition, the effect of substituents having various kinds ofelectron withdrawing of releasing groups were examinated. Considering the effect of substituents, anelectron withdrawing group attached at the 4-carbon position in 3-phenyloxadiazole derivatives decrease the reaction rate because of the lack of electron density on oxadiazole ring. The reaction rate of3-phenyloxadiazole derivatives with dipolarophiles were more conveniently measured using UV thanusing a volumetric analysis which was used before. From the result of this study, it was that thecycloaddition was found to be a first-order reaction depending upon the concentration of 3-phenyloxadiazole only.
3-Phenyloxadiazole 유도체의 1,3-dipolar Cycloaddition 반응에 미치는 온도의 영향
황성규,이기창,최봉종,이광일 ( Sung Kwy Hwang,Ki Chang Lee,Bong Jong Choi,Kwang Ill Lee ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.3
Ultraviolet spectrophotometric investigation has been carried out on the rate constants for 1,3-dipolar cycloaddition of 4-substituted-3-phenyloxadiazole derivatives with dipolarophiles such as phenyl acetylene, propiolic acid methyl ester and dimethylacetylene dicarboxylate. From there, the rate constants for 1,3-dipolar cycloaddition were determined at 80, 100 and 120℃, and the reaction rates were increased with increasing temperature, From these rate constants, the values of the thermodynamic activation parameters were obtained. Some thermodynamic activation parameters such as E_a, △H^*, △S^* and △G^* from Arrhenius equation were also calculated for the electrophilic 1,3-dipolar cycloaddition of 3-phenyloxadiazole derivatives with dipolarophiles. In order to the proposal the mechanism and reactivity of 1,3-dipolar cycloadditioin reaction, the effect of substituents having various kinds of electron withdrawing or releasing groups were examinated. Considering the effect of substituents, an electron withdrawing group attached at the 4-carbon position in 3-phenyloxadiazole derivatives decreases the reaction rate because of the lack of electron density in 3-phenyloxadiazole ring.