Mechanistic Analysis of Oxidative C-H Cleavages Using Inter- and Intramolecular Kinetic Isotope Effects.

Mechanistic Analysis of Oxidative C-H Cleavages Using Inter- and Intramolecular Kinetic Isotope Effects.
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DOI:
10.1016/j.tet.2009.10.088
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发表时间:
2009-12-26
期刊:
影响因子:
2.1
通讯作者:
Floreancig PE
Floreancig PE
中科院分区:
化学3区
文献类型:
--
作者:
Jung HH;Floreancig PE

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一系列的单氘代苄基和烯丙基醚进行氧化碳-氢键裂解,以确定在DDQ介导的环化反应中的分子内动力学同位素效应的结构变化的影响。将这些值与通过使非氘代和二氘代底物的混合物经受反应条件而获得的相应分子间动力学同位素效应进行比较。结果表明,碳-氢键断裂是速率决定和自由基阳离子是最有可能的反应机制中的关键中间体。
A series of monodeuterated benzylic and allylic ethers were subjected to oxidative carbon–hydrogen bond cleavage to determine the impact of structural variation on intramolecular kinetic isotope effects in DDQ-mediated cyclization reactions. These values are compared to the corresponding intermolecular kinetic isotope effects that were accessed through subjecting mixtures of non-deuterated and dideuterated substrates to the reaction conditions. The results indicate that carbon–hydrogen bond cleavage is rate determining and that a radical cation is most likely a key intermediate in the reaction mechanism.
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