by the hydroxyl radical formed in situ is occurred in the rate determining step, which is influenced by the steric and electronic effects of the substituted aryl group attached to this atom and also the stability of the radical intermediate involved in the oxidation reaction. The experimental results were supported by the computational studies.
在
乙腈水溶液中,过氧化二
硫酸钾将各种4-芳基取代的5-羰基乙氧基-2-氧-
1,2,3,4-四氢吡啶氧化为相应的4-芳基-5-羰基乙氧基-2-氧-1,2-
二氢吡啶在热条件下。获得的产物具有良好至优异的产率。基于所提出的机理,在速率确定步骤中发生了通过原位形成的羟基从杂环的C 4原子中除去氢的过程,该过程受取代芳基的空间和电子效应的影响与该原子相连的基团,以及与氧化反应有关的自由基中间体的稳定性。实验结果得到了计算研究的支持。