National Changhua University of Education Institutional Repository : Item 987654321/10061
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题名: Computational Study on the Stability of Imidazol-2-ylidenes and Imidazolin-2-ylidenes
作者: Cheng, M. J.;Hu, Ching-Han
贡献者: 化學系
日期: 2001-12
上传时间: 2012-05-03T06:17:00Z
出版者: Elsevier
摘要: The dimerization reactions of 12 cyclic diaminocarbenes have been studied using density functional theory (DFT). The activation energies (Ea) and reaction energies (ΔE) for the dimerizations of imidazol-2-ylidenes are larger than those of imidazolin-2-ylidenes. It was observed that Ea of dimerization is approximately proportional to the singlet–triplet energy separation (ΔES–T), aromatic stabilization energy (ASE), and ΔE of the carbene. Excellent linear correlation is seen between Ea and ASE. Contrary to previous suggestions, we found that 4,5-dichloro substitutions decrease the stability of imidazol(in)-2-ylidenes. Steric effects on Ea occur noticeably as isopropyl (i-Pr) substitutions are introduced to the carbenes.
關聯: Chemical Physics Letters, 349(5-6): 477-482
显示于类别:[化學系] 期刊論文

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