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題名 | Phase-Transfer Catalytic Reaction of Ethyl-2-Bromolsobutyrate and Phenol: Effects of Water and Temperature=2-溴異丁酸乙酯和酚之相間轉移觸媒催化反應之研究:水效應 |
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作者 | 王茂齡; 藍錦坤; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 37:4 民95.07 |
頁次 | 頁407-412 |
分類號 | 468.8 |
關鍵詞 | 2-溴異丁酸乙酯; 酚; 相間轉移觸媒; 催化反應; Ester-ether compound synthesis; Phase transfer catalysis; Etherification; Hydrolysis; Water and temperature effects; |
語文 | 英文(English) |
中文摘要 | 本研究成功地在氫氧化鉀水溶液及有機溶劑之二相介質中利用相間轉移觸媒催化反應由2- 溴異丁酸乙酯(ethyl-2-bromoisobutyrate)和酚(phenol)合成2-苯氧基異丁酸乙酯(ethyl-2- phenoxyisobutyrate)。在實驗過程中是以溴化四丁基銨(TBAB)做為相間轉移觸媒,其反應是介於有機相與水相間之界面進行。在本研究中,倡導了一個合理之反應機構。同時,也建立了動力學模式,在研究中發現介於溴-烷基鍵(Br-C bond)及酯官能基(-COOR)之水解反應皆在鹼性溶液中發生,本研究探討反應時水用量對2-溴異丁酸乙酯(ethyl-2- bromoisobutyrate)反應物之轉化率,水解2-苯氧基異丁酸乙酯(ethyl-2-phenoxyisobutyrate)產物之部分產率與2-苯氧基異丁酸乙酯(ethyl-2-phenoxyisobutyrate)產物(醚-酯產物)之影響皆有做深入之瞭解。 |
英文摘要 | The phase-transfer catalytic reaction (PTC) of ethyl-2-bromoisobutyrate and phenol for synthesizing ethyl-2-phenoxyisobutyrate was carried out in KOH solution/organic solvent two-phase medium. Tetrabutylammonium bromide (TBAB) was employed as the phase-transfer catalyst. The occurrence of the reaction on the interface between the organic and aqueous phases is discussed. A rational reaction mechanism is proposed here and used to build the kinetic model. Hydrolysis of the bromo-alkyl bond (Br-C bond) and the ester functional group (-COOR) was found to take place in an alkaline aqueous solution. The effects of the amount of water on the conversion of ethyl-2-bromoisobutyrate, the fractional yield of hydrolyzing ethyl-2-bromoisobutyrate, the fractional yield of hydrolyzing ethyl-2-phenoxy-isobutyrate, and the fractional yield of ethyl-2-phenoxyisobutyrate (ether-ester product) are investigated in detail. |
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