Copper complexes bearing 1,10-phenanthroline and some of its oxidized derivatives were prepared and characterized by the Emerson/Stokes collaboration. X-ray crystallography shows that the ligands adopted different coordination geometries about the copper(II) ion. The [Cu(dafo)2OTf]OTf complex showed a drastically different redox potential than the other complexes and appeared to be the best catalyst to support Chan-Evans-Lam coupling of phenylboronic acids to imidazole.
Cope, J. D.; Valle, H. U.; Hall, R. S.; Riley, K. M.; Goel, E.; Biswas, S.; Hendrich, M. P.; Wipf, D. O.; Stokes, S. L.; Emerson, J. P. Tuning of the Copper(II)/Copper(I) Redox Potential for More Robust Copper-Catalyzed C-N Bond Forming Reactions. Eur. J. Inorg. Chem. 2020, (14), 1278-1285.
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