Mesolysis Mechanisms of Aromatic Thioether Radical Anions Studied by Pulse Radiolysis and DFT Calculations
作者:Minoru Yamaji、Sachiko Tojo、Mamoru Fujitsuka、Akira Sugimoto、Tetsuro Majima
DOI:10.1021/acs.joc.5b00660
日期:2015.8.21
the benzyl β-naphthyl sulfide radical anion was found. From the Arrhenius analysis of the mesolysis with the stepwise mechanism, apparent activation energies (ΔEexp) were determined and compared with those (ΔEcal) estimated by the DFT calculations. Two types of C–S bond dissociation are possible to give the C radical and S anion (ArCH2•/Ar′S–) and the C anion and S radical (ArCH2–/Ar′S•). The dissociation
通过光谱测量和DFT计算,研究了2-甲基四氢呋喃在辐射分解过程中产生的八个芳香族硫醚自由基阴离子(ArCH 2 SAr' •)的介观分解机理。七个ArCH 2 SAr' •–通过苄基碳原子与硫原子之间的σ键解离而进行介观分解,从而形成具有逐步机理或协同机理的相应自由基和阴离子。相反,在苄基β-萘基硫醚自由基阴离子中没有发现介解作用。从具有逐步机理的介观分解的Arrhenius分析中,确定了表观活化能(ΔE exp)并将其与这些活化能(ΔE cal)进行了比较。)由DFT计算得出。两种类型的C–S键解离可能产生C自由基和S阴离子(ArCH 2 • / Ar'S –)和C阴离子和S自由基(ArCH 2 – / Ar'S •)。通过DFT计算估计了离解能(BDE(ArCH 2 • / Ar'S –)和BDE(ArCH 2 – / Ar'S •)),发现BDE(ArCH 2 • / Ar'S –)小于BDE(ArCH