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

Effects of amine nature and modification of electrophilic center from C=O to C=S on reactivity and mechanism

등록일
2008년 2월 14일 13시 31분 25초
접수번호
1381
발표코드
32P239포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅴ>
발표형식
포스터
발표분야
유기화학
저자 및
공동저자
윤소라, 엄익환1
이화여자대학교 화학과,
1이화여자대학교 나노과학부,
A kinetic study is reported for reactions of 4-nitrophenyl phenyl carbonate (5) and thionocarbonate (6) with alicyclic secondary amines in 20 mol % DMSO at 25.0 oC. The plots of kobsd vs. amine concentration are linear for the reactions of 5. On the contrary, the plots for the corresponding reactions of 6 curve upward as a function of increasing amine concentration. The Brønsted-type plot for the reactions of 5 with secondary amines exhibits a downward curvature. The kN values are larger for the reactions of 5 with secondary amines than for those with primary amines of similar basicity. k1 values for the reactions of 5 is larger for the reactions with secondary amines than for those with isobasic primary amines, while the k2/k–1 ratio is nearly identical. On the other hand, for reactions of 6, secondary amines exhibit larger k1 values but smaller k2/k–1 ratios than primary amines.

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