期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 16, 页码 5704-5707出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b01970
关键词
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资金
- NIH [R01 GM67173]
- NSF through the CCI Center for Selective C-H Functionalization [CHE-1205646]
- NSF [CHE-1048642, CHE-0840494]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1205646] Funding Source: National Science Foundation
Copper salts find widespread use in Pd-catalyzed oxidation reactions, and they are typically used as oxidants or redox-active cocatalysts. Here, we probe the origin of a dramatic acceleration effect of Cu(OTf)(2) in the C-H/C-H aerobic oxidative coupling of o-xylene. NMR spectroscopic analysis of the Pd-II catalyst in the presence of Cu(OTf)(2), together with other experimental and DFT computational studies of the catalytic reaction, show that Cu(OTf)(2) activates the Pd-II catalyst for C-H activation via a non-redox pathway and has negligible impact on catalyst reoxidation. These observations led to the testing of other metal triflate salts as cocatalysts, the results of which show that Fe(OTf)(3) is even more effective than Cu(OTf)(2).
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