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Origin of the Acceleration Effect of Ionic Liquids in Lewis acid-Catalyzed Reactions

등록일
2007년 8월 15일 10시 30분 42초
접수번호
0835
발표코드
34P252포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅲ>
발표형식
포스터
발표분야
유기화학
저자 및
공동저자
이지웅, 김진홍, 이진용, 신원상, 송충의
성균관대학교 화학과,
The origin of the acceleration effect of ionic liquids (ILs) in Lewis acid-catalyzed reactions was clearly elucidated for the first time. An imidazolium IL having very weakly coordinating anions such as PF6- or SbF6- activates metal triflate catalysts so that they become more electrophilic (i.e., more Lewis acidic) by anion exchange, which dramatically enhances the catalytic activity. As evidence for the anion exchange, spectroscopic analysis (e.g., solid-state and solution state 19F NMR and FAB-MS) and computational calculations were conducted. Moreover, it was also demonstrated that several types of Lewis acid can be activated, according to our catalyst activation mechanism, merely by mixing them with an soluble organic salt containing non-coordinating anions. Furthermore, the acidity of Lewis acids can be very simply tuned by proper selection of counter anions of soluble organic salts. We believe that the present study will open up new perspectives for Lewis acid chemistry.

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