Visible light-promoted metal-free C-H activation: diarylketone-catalyzed selective benzylic mono- and difluorination.


We report herein an operationally simple method for the direct conversion of benzylic C-H groups to C-F. We show that visible light can activate diarylketones to abstract a benzylic hydrogen atom selectively. Adding a fluorine radical donor yields the benzylic fluoride and regenerates the catalyst. The selective formation of mono- and difluorination… (More)
DOI: 10.1021/ja410815u


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