View : 118 Download: 0

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
ionalkalinucleophilicsubstitution
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
Fulltext
Show the fulltext
Appears in Collections:
일반대학원 > 화학·나노과학과 > Theses_Master
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE