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Catalytic Efficiency of [20]Paracyclophane Oxime and Cycloheptaamylose in the Decomposition of Carboxylate and Carbonate Esters

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タイトル: Catalytic Efficiency of [20]Paracyclophane Oxime and Cycloheptaamylose in the Decomposition of Carboxylate and Carbonate Esters
著者: Okamoto, Hiroshi / Horiguchi, Daikichi / Kondo, Hiroki / Sunamoto, Junzo
発行日: 1981年 1月
出版者: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
引用: 長崎大学工学部研究報告, (16), pp.81-87; 1981
抄録: The hydrolytic decomposition of dodecyl ρ-nitrophenyl carbonate (LPNC) and ρ-nitrophenyl dodecanoate (PNPL) as mediated by 10-hydroxy-ll-hydroxyimino[20]-paracyclophane (Oxime-I) and cycloheptaamylose (β-CD) has been investigated in aqueous media containing 9.9% (v/v) ethanol and 1.0% (v/v) acetonitrile to gain an insight into the reaction and/or substrate specificity. Both LPNC and PNPL were decomposed effectively by an equimolar amount of Oxime-I. It turned out from the analysis of kinetic data that the binding of LPNC to Oxime-I is 2.5 times tighter than that of PNPL, but the subsequent catalysis is 3.3 times more favorable for PNPL than for LPNC. Hence, the overall efficiency of Oxime-I is 1.3 times greater for PNPL, as changed from a 13-fold difference between both substrates in the simple alkaline hydrolysis. β-CD was found to be effective also in the decomposition of LPNC when added in large excess over substrate. Comparison of kinetic parameters between the two systems, Oxime-I and β-CD, indicated that the former is better in both binding and catalytic effects toward the extremely hydrophobic substrates.
URI: http://hdl.handle.net/10069/24008
ISSN: 02860902
資料タイプ: Departmental Bulletin Paper
原稿種類: publisher

引用URI : http://hdl.handle.net/10069/24008



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