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Polyfluorinated, electron-withdrawing, and sterically demanding supporting ligands are of significant value in chemistry. Here we report the assembly and use of a bis(pyrazolyl)borate, [PhB(3-(SF)Pz)] that combines all such features, and involves underutilized pentafluorosulfanyl substituents. The ethylene and carbonyl chemistry of copper(i) supported by [PhB(3-(SF)Pz)], a comparison to the trifluoromethylated counterparts involving [PhB(3-(CF)Pz)], as well as copper catalyzed cyclopropanation of styrene with ethyl diazoacetate and CFCHN are presented.

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