期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 35, 页码 8279-8288出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201900583
关键词
catalysis; cross-coupling; guanidines; phenols; redox-active ligands
资金
- Deutsche Forschungsgemeinschaft (DFG)
Due to their large importance in synthetic chemistry, catalytic C-C coupling reactions of phenols are currently intensively studied. Herein, new copper catalysts for the C-C coupling reaction of phenols using dioxygen as a green oxidizing reagent are reported. By using redox-active guanidine ligands, the activity as well as chemoselectivity in the cross-coupling reaction of non-complementary phenols (between an electron-rich phenol and a less nucleophilic second phenol) is significantly improved. Based on the collected data for several test reactions, a reaction mechanism is proposed.
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