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第三讲-自由基链式反应的速率和选择性

Lecture 3 - Rate and Selectivity in Radical-Chain Reactions
课程网址: http://videolectures.net/yalespan125bs2011_mcbride_lec03/  
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:
反应选择性原理解释了为什么在从碳中提取氢原子时,溴原子比氯原子更具选择性。向烯烃中添加HBr的自由基机制解释了其反马尔科夫尼科夫区域特异性。需要仔细分析以了解涉及催化剂的反应的动力学顺序。自由基链反应的终止可以使其在引发剂中的速率达到半级。自由基及其反应伙伴质子化产生的选择性说明了离子电荷在决定反应速率中的重要性。
课程简介: The reactivity-selectivity principle explains why bromine atoms are more selective that chlorine atoms in abstracting hydrogen atoms from carbon. A free-radical mechanism for adding HBr to alkenes explains its anti-Markovnikov regiospecificity. Careful analysis is required to understand kinetic order for reactions involving catalysts. Termination of radical-chain reactions can make their rate half-order in the initiator. Selectivity due to protonation of radicals and their reaction partners illustrates the importance of ionic charge in determining reaction rates.
关 键 词: 反应选择性原理; 自由基链反应; 反应速率
课程来源: 视频讲座网
数据采集: 2021-11-18:zkj
最后编审: 2021-11-18:zkj
阅读次数: 59