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2-Fluorenyl chalcone 유도체의 합성과 가수분해반응에 관한 연구
이기창,황성규,윤철훈,오세영 명지대학교 자연과학연구소 1995 자연과학논문집 Vol.12 No.-
Fluorenyl chalcone 유도체를 합성하였고 25 ±1℃의 20% dioxane-H?O 혼합용매 중에서 자외선 분광광도법을 이용하여 pH 1.0~13.0까지의 넓은 pH범위에서 가수분해 반응속도를 측정하였다. 또한 Fluoreny chalcone 유도체의 pH변화에 따른 반응속도로 측정하고, 일반염기효과, 치환기효과 및 가수 분해 생성물 확인 등으로부터 Fluorenyl chalcone 유도체에 대한 가수분해 반응속도상수를 구하였다. 이들 유도체들은 pH와 무관한 부분과 수산화 이온농도에 비례하며, pH와 무관한 부분에서는 중성의 물분자가 첨가된다. 반응속도 상수 측정으로부터 Fluorency chalcon 유도체의 가수분해 반응은 비가역 1차 반응임을 확인하였고, 치환기효과로부터 전자유인성기에 의해 반응이 촉진되는 것을 알 수 있었다. 또한, 가수분해 최종 생성물은 확인 결과 2 ~acetyl fluorene과 벤즈알데히드였다. 이러한 실험결과를 토대로 하여 Fluorenyl chalcone 유도체에 대한 가수분해 반응 메카니즘을 제안하였다. Fluorenyl chalcone derivatives were synthesis, it was measured that hydrolysis made use of ultraviolet spectrophotometry at a wide pH 1.0 ~ 13.0 range in 20% dioxane-H?O solution, 25±1℃. On the basis of general base catalysis, substitutent effect and confirmation of hydrolysis product, it was measured the reaction rate of fluorenyl chalcone derivatives for the pH change. It maybe concluded that a part was unrelated to pH and another part was in proportion to concentration of hydroxide ion: Above pH 10.0, It was in propotion to concentration of hydroxide ion, a part having no concern with pH was added to the neutral H?O molecule. From the result of measurement the reaction rate, hydrolysis of fluorenyl chalcone derivatives confirmed to the irreversible first order through measurement the substituent effect, It was found that reaction rate was accelerated first order through measurement the substituent effect, It was found that reaction rate was accelerated by electron attracting group. Also, from the result of final product, there were 2-acetyl fluorene benzaldehyde.On the basis of these findings, Hydrolysis for the fluorenyl chalcone derivative was proposed a fitting mechanism.