Hantzsch酯和N甲基Hantzsch酯分别和9亚芴基丙二腈和1,1二苯基2,2二腈基乙烯反应机理的研.pdfVIP

A Study on the Reaction of Hantzsch ester and N-Methyl Hantzsch Ester with 9-Fluorenylidenemalononitrile and 1,1-Diphenyl-2,2-dicyanoethylene. A Probe for the Extreme of Concerted Electron Transfer-Hydrogen Atom Transfer Mechanism1 Fang Xinqiang a, Xu Huajian a, Liu Youcheng a,b, Fu Yao a, Wu Yundong c aDepartment of Chemistry, University of Science and Technology of China, Hefei, Anhui China (230026) b College of Chemistry, Lanzhou University, Lanzhou, Gansu, China (730000) cDepartment of Chemistry , The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China In recent years, the idea that hydride transfer from coenzyme NADH models takes place through a concerted electron transfer and hydrogen atom transfer pathway (concerted hydride 1-3 4 transfer) has gained increasing support from many investigations. Verhoeven et al. have applied the valence-bond configuration mixing (VBCM) model5 to the study of mechanism and transition-state structure of hydride transfer reactions mediated by NAD(P)H models and rationalized the results with the notion that the general accurrence of concerted hydride transfer as the lowest energy reaction pathway, which also explains why the activation energy of such a concerted pathway is often linearly related to that of a hypothetical single electron transfer process.