簡易檢索 / 詳目顯示

研究生: 黃瀕媚
Huang, Pin-Mei
論文名稱: 利用鹼催化環合形成5-腈尿嘧啶的反應:動力學以及反應機制之研究
General-base catalyzed ring-closure reactions to 5-yanouracils:kinetic and mechanistic studies
指導教授: 宋光生
Sung, Kuangsen
學位類別: 碩士
Master
系所名稱: 理學院 - 化學系
Department of Chemistry
論文出版年: 2006
畢業學年度: 94
語文別: 中文
論文頁數: 55
中文關鍵詞: Brønsted圖動力學研究5-腈尿嘧啶環合反應機制研究同位素效應
外文關鍵詞: Brønsted plot, isotope effect, kinetic studies, mechanistic studies, ring closure, 5-cyanouracil
相關次數: 點閱:66下載:1
分享至:
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報
  • Z-ethyl[2-cyano-3-(substituted-amino)acry-loyl] carbamate, Z-3a~c的環合反應是一個general-base catalysis的反應。我們利用動力學實驗方法得知此反應的一級動力同位素效應值 kH/kD = 1.40;並從實驗結果得知Brønsted β value為0.174;同時藉由立體效應影響的實驗結果發現氮上取代基立體障礙越大、或為拉電子取代基皆會使環合反應速率變慢。
    我們綜合kinetic isotope effect、 Brønsted plot和 N-substituent effect的實驗結果,進一步推導出Z-3a~c的鹼催化環合反應的反應機制,發現反應速率決定步驟包含proton transfer並同時發生分子內親核加成,隨後才脫去ethoxide。

    The ring-closure reactions of Z-ethyl[2-cyano-3- (substituted-amino)acry-loyl] carbamate, Z-3a~c, are general-base catalysis. Primary kinetic isotope effect of kH/kD = 1.40, the Brønsted β value of 0.174, and reduction of the NEt3-catalyzed ring-closure rates by bulky or electron-withdrawing N-substituents confirm that the mechanism for the general-base catalyzed ring-closure reactions of Z-3a~c involves the rate-determining simultaneous proton transfer and intramolecular nucleophilic addition, followed by elimination of ethoxide.

    考試合格證明 中文摘要 英文摘要 Section 1 動力學實驗(Kinetic Studies.) 第一章 緒論 01 1.1 研究動機 01 1.2 實驗原理 04 1.2.1 Arrhenius Equation 04 1.2.2 Transition State Theory 08 1.2.3 Brønsted Catalysis Law 12 1.2.4 Isotope Effect 16 1.2.4.1 Primary Isotope Effect 18 1.2.4.2 Secondary Isotope Effec 21 第二章 實驗系統與實驗數據 24 2.1 Kinetic studies of base-catalyzed ring-closure reaction of Z-3a for the Brønsted plot 24 2.2 Preparation of N-deuterium Z-3a 30 2.3 Kinetic studies of base-catalyzed ring-closure reaction of Z-3a and N-deuterium Z-3a for the isotope effect. 31 2.4 Kinetic studies of base-catalyzed ring-closure reaction of Z-3a, Z-3b and Z-3c 34 第三章 結果與討論 38 第四章 結論 45 Section 2 Separation of Enantiomers by Chiral HPLC. Analytic compound(1):1-phenylethanol 48 Analytic compound(2):1-(methoxyphenyl)ethanol 49 Analytic compound(3):(1S,3S)-1-phenylbutane-1,3-diol 50 Analytic compound(4):(S)-3-oxo-1-phenylbutyl acetate 51 Analytic compound(5) 52 Analytic compound(6):N-(1-phenylethyl)benzenamine 53 第五章 參考資料 54

    1.Daher, G. C.; Harris, B. E.; Diasio, R. B. Pharmac. Ther. 1990, 48, 189.
    2.Miyashita, O.; Matsumura, K.; Shimadzu, H.; Hashimoto, N. Chem. Pharm. Bull.
    1981, 29, 3181.
    3.莊博仁,碩士論文,成功大學,2005.
    4.(a) Sung, K.; Lin, M.-C.; Huang, P.-M.; Zhuang, B.-R.; Sung, R.; Wu, R.-R.
    Arkive of Org. Chem. (ARKIVOC) 2005, xiii, 131. (b) Sung, K.; Lin, M.-C.;
    Huang, P.-M.; Zhuang, B.-R.; Sung, R.; Wu, R.-R. J. Phys. Org. Chem. 2005,
    18, 1183.
    5.Pross, A. Theoretical & Physical Principles of Organic Reactivity, Wiley,
    New York, 1995.
    6.Hammett, L. P. Chem. Rev. 1935, 17, 125.
    7.Candian Journal of Chemistry. 1971, 49, 2199.
    8.Maskill, H. The Physical Basis of Organic Chemistry, Oxford University Press:
    oxford, 1985.
    9.Jencks, W. P. Chem. Rev. 1985, 85, 511.
    10.Streitwieser, A.; Jagow. R. H.; Fahey, R. C.; Suzuki, S. J. Am. Chem. Soc.
    1958, 80, 2326.
    11.Leffler, J. E. Science, 1953, 117, 340.
    12.Pross, A.; Shaik, S. S. New J. Chem. 1989, 13, 427.
    13.Brønsted, J. N. Chem. Rev. 1928, 5, 231.
    14.Hine, Jack Sylvester, Physical Organic Chemistry, McGraw-Hill, New York,
    1956.
    15.Isaacs, N. S. Physical Organic Chemistry, Wiley, New York, 1987.
    16.Ritchie, C. D. Physical Organic Chemistry :The Fundamental Concepts, M.
    Dekker, New York, 1990.
    17.Sung, K.; Chen, F.-L. Org. Lett. 2003, 5, 889.
    18.Cho, B. R.; Kim, K. D.; Lee, J. C.; Cho, N. S. J. Am. Chem. Soc. 1988, 110,
    6145.

    下載圖示 校內:立即公開
    校外:2006-06-21公開
    QR CODE