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Application of Marcus Theory for Hydride Transfer Reactions with Heteroaromatic Compounds

등록일
2007년 8월 8일 14시 49분 56초
접수번호
0186
발표코드
34P250포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 <발표Ⅰ>
발표형식
포스터
발표분야
유기화학
저자 및
공동저자
한인숙, 길현주1
강원대학교 과학교육학부,
1강원대학교 화학과,
2-[2'- Furyl, thienyl and pyrrolyl]-1,3-dimethylbenzimidazolines have been prepared in order to measure the rate of oxidation of these compounds by 1-benzyl-3-carbamoylpyridinium ion and by 1-benzyl-5-nitroisoquinolinium ion. The reactions were monitored spectophotometically in a solvent consisting of 4 parts of 2-propanol and one part of water by volume at 25℃. Reduction potential for the oxidants(OBI+, SBI+ and NBI+) have been estimated by assuming that the K's would be the same and accepting -361mV as the reduction potential of 1-benzyl-3-carbamoylpyridinium ion. The oxidants give linear Brφnsted plots with the slopes, α's respectively. The αvalues vary systematically with the spontaneity. Within the modified Marcus theory the present system presents the evidence of parallel(Leffler-Hammind) effect on the Brφnsted α. These results rationalize the one-step mechanism of hydride transfer without the intervention of high-energy intermediate.

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