Superkiller of CF bonds: Two new LiEt3BH/Ni-based catalyst systems for the hydrodefluorination (HDF) of fluoroarenes and trifluorotoluenes were reported. Both fluoroarenes and trifluorotoluenes were reduced to the corresponding arenes and toluenes in excellent yields with LiEt3BH in the presence of 40 % NiCl2, whereas a catalytic amount of NiCl2(PCy3)2 (typically 5 mol %) along with LiEt3BH exhibited high activity and selectivity in the HDF of fluoroarenes and was inert to trifluorotoluenes.
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