"“动力学来说”是没啥意义的" or people doing kinetics of radical chemistry might lose job...
I don't know based on what you said 反应能垒普遍都低, 1 kcal/mol makes huge difference to determine k and K. DMPO and OH dot has energy barrier more than 6 kcal/mol in aqueous solution. I could not believe a reaction such as H2O-->H dot and OH dot through radiolysis has anything to do with equilibrium.
那么为什么自由基放着密集电子的双键不管反而跑去抓羟基氢？I am not saying it necessarily go that route but depending on the energy barrier again. I told beking on the premise of electriphility of OH dot，OH dot will attack electron donating group on ring, which is general case not necessarily applying to any case. I did not do the calculation on VC and OH dot. Or maybe you can give us more detailed information how VC reacting with OH dot than "1. 是双键给电子，生成的相对稳定radical cation(自由基旁边有两个羰基一个羟基)，氧原子的孤对电子很难直接跟自由基反应 2. 见1..."




“动力学来说”是没啥意义的，自由基反应通常不考虑反应能垒
因为反应能垒普遍都低，大部分自由基反应处于equilibrium中
所以通常只考虑新生成自由基的热力学稳定性
因此这个反应必须不是H-abstracion
通过自由基的H-abstraction与羟基生成一个不稳定的oxygen radical?
我还从没在有机反应里见过

“环位电子比链上密集得多”是在具体地说VC么，好吧姑且承认这是对的
那么为什么自由基放着密集电子的双键不管反而跑去抓羟基氢？
你的原因不能推导出你的结论
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