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第30讲-氧化状态和机理Lecture 30 - Oxidation States and Mechanisms |
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| 课程网址: | http://videolectures.net/yalespan125bs2011_mcbride_lec30/ |
| 主讲教师: | J. Michael McBride |
| 开课单位: | 耶鲁大学 |
| 开课时间: | 2014-08-19 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | A difficult exam question shows how visible and NMR spectroscopy related to long-term misassignment of the structure for the triphenylmethyl dimer. Evidence from 1970 shows that Friedel-Crafts propylation involves an SN2 mechanism, not a protonated cyclopropane. Assigning oxidation states from -4 to +4 to the carbon atoms of proposed starting material and product allows choosing whether a reagent that is oxidizing or reducing or neither is appropriate. Beyond belonging to the appropriate redox class, the reagent must have an appropriate mechanism. Alcohol oxidations by elemental bromine and by Cr+6 reagents are shown to involve familiar substitution, elimination, and addition mechanisms. Mechanistic understanding allows adjusting conditions to make oxidation selective. |
| 关 键 词: | 可见光; 核磁共振波谱; 氧化状态 |
| 课程来源: | 视频讲座网 |
| 数据采集: | 2021-11-17：zkj |
| 最后编审: | 2021-11-17：zkj |
| 阅读次数: | 38 |