Iron(III) Nitrate/TEMPO-Catalyzed Aerobic Alcohol Oxidation: Distinguishing between Serial versus Integrated Redox Cooperativity.
Iron(III) Nitrate/TEMPO-Catalyzed Aerobic Alcohol Oxidation: Distinguishing between Serial versus Integrated Redox Cooperativity.
复制标题
铁(iii)硝酸盐/tempo催化有氧醇氧化:区分串行与综合氧化还原合作。
DOI:
10.1021/jacs.1c05224
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发表时间:
2021-07-21
影响因子:
15
通讯作者:
Stahl SS
中科院分区:
文献类型:
--
作者:
Nutting JE;Mao K;Stahl SS
Aerobic alcohol oxidation catalyzed by transition-metal salts and aminoxyls are prominent examples of cooperative catalysis. Cu/aminoxyl catalysts have been studied previously and feature “integrated cooperativity”, in which CuII and the aminoxyl participate together to mediate alcohol oxidation. Here, we investigate a complementary Fe/aminoxyl catalyst system and provide evidence for “serial cooperativity”, involving a redox cascade in which alcohol is oxidized by in situ-generated oxoammonium species, which is directly detected in the catalytic reaction mixture by cyclic step chronoamperometry. The mechanistic difference between the Cu and Fe-based catalysts arises from the use iron(III) nitrate, which initiates a NOx-based redox cycle for oxidation of aminoxyl/hydroxylamine to oxoammonium. The different mechanisms for the Cu- and Fe-based catalyst systems are manifested in different alcohol oxidation chemoselectivity and functional group compatibility.
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