the experimental activation energy for transfer of a hydride equivalent between these species. It is concluded that single electron-transfer (SET) cannot occur as a primary step in the overall hydride-transfer process except for substrates with very strong one-electron oxidizing properties. A simple valence-bond configuration mixing (VBCM) model is presented, that rationalizes the general occurrence
计算了将一个电子从
NAD(P)H和相关的1,4-
二氢吡啶转移到一系列底物中的能量,并将其与在这些物质之间转移
氢化物当量的实验活化能进行了比较。结论是,除了具有非常强的单电子氧化性能的衬底外,单电子转移(
SET)不能作为整个
氢化物转移过程的主要步骤。提出了一个简单的价键构型混合(VBCM)模型,该模型合理化了协调一致的
氢化物转移作为最低能量反应途径的普遍发生,并进一步解释了为什么这种协调一致的途径的活化能通常与氢的活化能线性相关。 -假设-
SET过程。