Abstract
Oxidation of binuclear Pd(II) complexes with PhICl(2) or PhI(OAc)(2) has previously been shown to afford binuclear Pd(III) complexes featuring a Pd-Pd bond. In contrast, oxidation of binuclear Pd(II) complexes with electrophilic trifluoromethylating ("CF(3)(+)") reagents has been reported to afford mononuclear Pd(IV) complexes. Herein, we report experimental and computational studies of the oxidation of a binuclear Pd(II) complex with "CF(3)(+)" reagents. These studies suggest that a mononuclear Pd(IV) complex is generated by an oxidation-fragmentation sequence proceeding via fragmentation of an initially formed, formally binuclear Pd(III), intermediate. The observation that binuclear Pd(III) and mononuclear Pd(IV) complexes are accessible in the same reactions offers an opportunity for understanding the role of nuclearity in both oxidation and subsequent C-X bond-forming reactions.
Highlights
Chemical shifts are reported in ppm with the solvent resonance as the internal standard
The following solvent chemical shifts were used as reference values: CDCl3 = 7.26 (1H), 77.0 (13C); CD2Cl2 = 5.32 (1H), 53.8 (13C); C2D4Cl2 = 3.72 (1H); benzene-d6 = 7.15 (1H), 128.0 (13C)
The acetate chemical shift for 9 is at 2.74 ppm. This is similar to the corresponding chemical shifts of 2 (2.69 ppm) and of 3 (2.71 ppm)
Summary
David C., Eunsung Lee, Alireza Ariafard, Melanie S.
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