Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Kinetics for Mononuclear Heterocyclic Rearrangement of N-(5-phenyl-1,2,4-oxadiazol-3-yl)-N'-arylformamidine (I)

N-(5-phenyl-1,2,4-Oxadiazol-3-yl)-N'-arylformamidine의 Mononuclear Heterocyclic Rearrangement반응에 대한 반응속도론 (제1보)

  • Jung Ui Hwang (Department of Chemistry, College of Natural Sciences, Kyungpook National University) ;
  • Jong Jae Chung (Department of Chemistry, College of Natural Sciences, Kyungpook National University) ;
  • Young Zoo Youn (Department of Chemistry, College of Natural Sciences, Kyungpook National University)
  • 황정의 (경북대학교 자연과학대학 화학과) ;
  • 정종재 (경북대학교 자연과학대학 화학과) ;
  • 윤영주 (경북대학교 자연과학대학 화학과)
  • Published : 1988.08.20
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Abstract

Reaction rates for mononuclear heterocyclic rearrangement of N-(5-phenyl-1,2,4-oxadiazol-3-yl)-N'-arylformamidines into 3-acylamino-1-aryl-1,2,4-triazoles were determined spectrophotometrically in dioxane/water (50 : 50, v/v). There are two different reaction paths according to pH. One is pH-independent path, the other is pH-dependent one. In pH-independent path, the result of substituent effect by IYT equation show that N-H bond breaking as well as new N-N bond formation controls the reaction rate. In pH-dependent path, concave-upward Hammett plot was observed. It can be concluded that new N-N bond formation is more advanced than N-H bond breaking in transition state for electron-donating substituents, but N-H bond breaking is more advanced than new N-N bond formation for electron-withdrawing substituents.

Dioxane/water (50 : 50, v/v) 용매 중에서 N-(5-phenyl-1,2,4-oxadiazol-3-yl)-N'-arylformamidine의 mononuclear heterocyclic rearrangement반응에 대한 속도를 분광광도법으로 측정하였다. pH에 따라 두가지의 다른 반응경로, 즉 pH에 무관한 경로와 pH에 의존하는 경로가 있음을 알았다. pH에 무관한 경로에서는 치환기효과를 IYT식으로 해석한 결과 질소-질소 결합의 형성이 우세하지만 질소-수소 결합도 약간 절단된 전이상태를 가진다고 결론지을 수 있었다. 한편 pH에 의존하는 경로에서는 위로 오목한 Hammett plot를 나타냈으며, 이는 전이상태에서 전자를 미는 치환기의 경우에는 질소-질소 결합의 형성이 질소-수소 결합의 절단보다 진전되어 있고 전자를 당기는 치환기의 경우에는 질소-수소 결합의 절단이 질소-질소 결합의 형성보다는 약간 더 진전되어 있기 때문으로 결론지을 수 있었다.

Keywords

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