第三部分介绍了醋酸锰引发的碳自由基与杂芳烃的选择性反应，并将该方法成功地应用到天然产物紫檀素关键中间体的合成中。
Finally, a new methodology, based on Mn (III) promoted carbon radical reactions, was developed to provide intermediates that should be useful in the synthesis of pterocarpan phytoalexins.
其结果证实：在种种分子重排反应中，总是趋向于生成结构更稳定的碳正离子或碳负离子或自由基中间体及其产物。
Their result affirm: in all sorts of molecular rearrangement reactions, anyway tend to produce more stable carbocation, or carboanion, or free radical middle substance and their products.
方法：在香烟中分别添加了天然抗氧化剂、纳米材料、硅藻土、活性碳及抗氧化剂组合物，并用电子顺磁共振仪(esr)对香烟烟气自由基的含量进行测定。
Methods: Free radical content in cigarette smoke, in which were added natural antioxidant, nanometer material, diatomite, activated carbone and antioxidant-activated carbone, were determined by ESR.
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