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Metal ion effects of alkali metal ions on nucleophilic substitution reactions of aryl esters with alkali metal ethoxides in absolute ethanol
- Title
- Metal ion effects of alkali metal ions on nucleophilic substitution reactions of aryl esters with alkali metal ethoxides in absolute ethanol
- Authors
- 李潤鋌
- Issue Date
- 1997
- Department/Major
- 대학원 화학과
- Keywords
- ion; alkali; nucleophilic; substitution
- Publisher
- 이화여자대학교 대학원
- Degree
- Master
- Abstract
- Aryl furoates 또는 aryl thiophenecarboxylates와 alkali meta1 ethoxides의 친핵성 치환 반응의 속도를 25.O℃ ethanol에서 분광학적 방법을 이용하여 측정하였다. Alkali metal ethoxides와 p-nitrophenyl esters 또는 p-nitrothiophenyl esters의 반응성은 EtO^(-)p-nitrothiopnenyl ester>8-(5-nitroquinolyl) ester의 순으로 감소하는 반면 금속이온의 촉매효과 크기는 8-(5-nitroquinolyl) ester>p-nitrophenyl ester>p-nitrothiophenyl ester순으로 감소하였다. 이런 결과는 8-(5-nitroquinolyl) ester의 경우 이탈기의 oxygen과 nitrogen이 금속이온과 5-membered ring을 형성하여 이탈기 효과를 보이기 때문인 것으로 추정된다.;Rate constants have been measured spectrophotometrically for the reactions alkali metal ethoxides (EtOM) with aryl furoates and thiophenecarboxylates in absolute ethanol at 25.0±0.1℃. The reactivity of EtOM with p-nitrophenyl esters and p-nitrothiophenyl esters increases in the order 18C6 + EtOKp-nitrothiophenyl ester>8-(5-nitroquinolyl) ester. But the reactivity of catalytic effect increases p-nitrothiophenyl ester
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- 일반대학원 > 화학·나노과학과 > Theses_Master
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