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The palladium‐catalyzed chemoselective carbonylation of bromoaryl triflates is reported. The selective C−Br bond versus C−OTf (OTf=triflate) bond functionalization can be remarkably tuned by the combination of the ligand [4,5‐bis(diphenylphosphino)‐9,9‐dimethylxanthene (Xantphos) vs. 1,1′‐bis(diphenylphosphino)ferrocene (DPPF)] and the solvent (toluene vs. DMSO). The respective ligand and solvent effects are rationalized by DFT calculations. In contrast, the monodentate ligands BuPAd 2 and t Bu 3 P prefer the selective C−Br bond activation and are solvent insensitive.
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Shen et al. (2017) studied this question.
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