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  • 02월 22일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Aminolysis of 3,4-Dinitrophenyl Cinnamate and Benzoate: Activation Parameters and Transition-State Structures

등록일
2008년 2월 14일 13시 27분 15초
접수번호
1374
발표코드
32P233포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅴ>
발표형식
포스터
발표분야
유기화학
저자 및
공동저자
박윤민, 엄익환
이화여자대학교 나노과학부,
The apparent second-order rate constants (kN) have been dissected into the microscopic rate constants (i.e., k1 and k2/k–1) associated with the reactions of Y-substituted phenyl cinnamates (5a-g) with piperidine and morpholine on the assumption that the reactions proceed through a stepwise mechanism with a change in the rate-determining step .The k1 value is larger for the reactions with the more basic piperidine that for those with less basic morpholine. However, the k2/k–1 ratio is almost the same for the reaction of 3,4-dinitrophenyl cinnamate (5a) with piperidine and for that with morpholine, which is not possible if the reactions proceed through a stepwise mechanism. The reaction of 5a results in a lager enthalpy of activation (ΔH‡) but a less negative entropy of activation (ΔS‡) than that of 1a. Thus, the aminolysis of 5a-g has been proposed to proceed through a concerted mechanism

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