C–O Bond Cleavage of Alcohols via Visible Light Activation of Cobalt Alkoxycarbonyls

C–O Bond Cleavage of Alcohols via Visible Light Activation of Cobalt Alkoxycarbonyls
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通过可见光活化烷氧基羰基钴来裂解醇的 C–O 键

DOI:
10.1021/acs.organomet.9b00552
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发表时间:
2019
期刊:
影响因子:
2.8
通讯作者:
Martin, David B.
Martin, David B.
中科院分区:
化学2区
文献类型:
--
作者:
Chambers, Dana R.;Juneau, Antoine;Ludwig, Cory T.;Frenette, Mathieu;Martin, David B.

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描述了通过羰基化-均解-脱羧过程活化醇中C-O键的策略。使用容易获得的钴(II)卟啉前体,简单醇的羰基化提供了获得烷氧基羰基钴(III)络合物的途径。光谱学,晶体学和计算方法被用来提供结构的细节和估计的Co-C键离解能的烷氧基羰基钴(III)的配合物的39.8千卡/摩尔的第一次。在自由基捕获剂克里思和硫醇还原剂存在下的可见光照射分别证明了在氧化和还原条件下醇C-O键的裂解。添加化学计量的还原剂允许使用催化量的受阻硫醇将苯甲醇还原为相应的烃。
A strategy for the activation of C–O bonds in alcohols via a carbonylation–homolysis–decarboxylation process is described. Using readily available cobalt(II) porphyrin precursors, carbonylation of simple alcohols provides access to alkoxycarbonyl cobalt(III) complexes. Spectroscopic, crystallographic, and computational methods are used to provide structural details and an estimate for the Co–C bond dissociation energy of an alkoxycarbonylcobalt(III) complex of 39.8 kcal/mol for the first time. Visible light irradiation in the presence of the radical trapping agent TEMPO and a thiol reducing agent demonstrates the cleavage of the alcohol C–O bond under oxidative and reductive conditions, respectively. Addition of a stoichiometric reducing agent allows the use of a catalytic amount of hindered thiol for the reduction of a benzylic alcohol to the corresponding hydrocarbon.
DOI: 10.1021/ja00366a046
发表时间: 1982-05
影响因子: 15
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