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The catalytic effect of alkali metal ions on reactions of 8-(5-nitroquinolyl) 2-furoate with alkali metal ethoxides in anhydrous ethanol

Title
The catalytic effect of alkali metal ions on reactions of 8-(5-nitroquinolyl) 2-furoate with alkali metal ethoxides in anhydrous ethanol
Authors
Um I.-H.Lee S.-E.Min J.-S.
Ewha Authors
엄익환
SCOPUS Author ID
엄익환scopusscopus
Issue Date
2001
Journal Title
Bulletin of the Korean Chemical Society
ISSN
0253-2964JCR Link
Citation
vol. 22, no. 7, pp. 669 - 672
Indexed
SCI; SCIE; SCOPUS; KCI WOS scopus
Abstract
Pseudo-first-order rate constants have been measured spectrophotometrically for the title reactions. The plot of kobs vs the concentration of alkali metal ethoxides is linear for the reactions performed in the presence of complexing agent, 18-crown-6 ether, but curved upwardly for the corresponding reactions performed in the absence of the complexing agent, indicating that the alkali metal ions studied in this study behave as a catalyst. The catalytic effect was found to increase in the order Li+ << K+ ≤ Na+. Second-order rate constants were determined for the reactions with dissociated free ethoxide (kEtO-) and with ion paired alkali metal ethoxides (kEtO-M+) from ion pairing treatments. The magnitude of catalytic effect (kEtO-M+/kEtO-) was found to be 2.3, 9.5 and 8.7 for the reaction of 8-(5-nitroquinolyl) 2-furoate, while 1.4, 3.6 and 4.2 for that of 4-nitrophenyl 2-furoate, indicating that the catalytic effect is larger in the reaction of the former substrate than in that of the latter one. The larger catalytic effect was attributed to two possible complexing sites with alkali metal ions in the former substrate.
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자연과학대학 > 화학·나노과학전공 > Journal papers
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