Catalytic Ring-Opening of Cyclic Alcohols Enabled by PCET Activation of Strong O-H Bonds.

Catalytic Ring-Opening of Cyclic Alcohols Enabled by PCET Activation of Strong O-H Bonds.
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通过PCET激活强O-H键可以激活环状醇的催化环。

DOI:
10.1021/jacs.6b06517
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发表时间:
2016-08-31
影响因子:
15
通讯作者:
Knowles RR
Knowles RR
中科院分区:
化学1区
文献类型:
--
作者:
Yayla HG;Wang H;Tarantino KT;Orbe HS;Knowles RR

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我们报道了一种新的光催化方案,通过C-C键断裂将环醇氧化还原-中性异构化成线性酮。机理研究表明,该反应中的关键烷氧基自由基中间体是通过不寻常的分子内PCET过程中醇O-H键的直接均解激活产生的,其中电子移动到近端自由基阳离子,同时质子转移到弱Brønsted碱。有效的结合强度可以准确预测给定氧化剂/碱基对生成烷氧基自由基的可行性。
We report a new photocatalytic protocol for the redox-neutral isomerization of cyclic alcohols to linear ketones via C-C bond scission. Mechanistic studies demonstrate that key alkoxy radical intermediates in this reaction are generated via the direct homolytic activation of alcohol O-H bonds in an unusual intramolecular PCET process, wherein the electron travels to a proximal radical cation in concert with proton transfer to a weak Brønsted base. Effective bond strength considerations are shown to accurately forecast the feasibility of alkoxy radical generation with a given oxidant/base pair.
DOI: 10.1021/jacs.5b05377
发表时间: 2015-07-29
影响因子: 15
作者:
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通讯作者: Knowles RR
DOI: 10.1039/c3cc46391e
发表时间: 2013-11-25
期刊: Chemical communications (Cambridge, England)
影响因子: --
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通讯作者: Que L Jr
DOI: 10.1021/ja970259q
发表时间: 1997-04-30
影响因子: 15
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