Surface-active ionic liquids in catalysis: Impact of structure and concentration on the aerobic oxidation of octanol in water

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• 作者：Alice Cognigni ; Sebastian Kampichler ; Katharina Bica ; ^{katharina.schroeder@tuwien.ac.at}
• 关键词：Micellar catalysis ; Water ; Surfactants ; Ionic liquids ; Aerobic oxidation ; Palladium
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 April 2017
• 年：2017
• 卷：492
• 期：Complete
• 页码：136-145
• 全文大小：1208 K
• 卷排序：492

文摘

We present design and synthesis of surface-active ionic liquids for the application in micellar catalysis. A series of 1-methyl-3-dodecylimidazolium based ionic liquids with variable core structures including dicationic and zwitterionic ones was synthesized and characterized. These surface-active ionic liquids where applied in the aerobic oxidation of aliphatic alcohols to carbonyl compounds. A strong dependence on the ionic liquid concentration and structure was identified, which is in accordance with the concepts of micellar catalysis. Optimum conditions for the oxidation of 1-octanol could be identified, and the use of surface-active ionic liquids strongly improved the reaction performance compared to pure water. Under optimized conditions, it was possible to isolate up to 75% of octanoic acid using only small amounts of surface-active ionic liquid in a 0.05 mM solution in water without further ligands.