The synergistic use of CuF2 and low-valent nickel species was initially demonstrated by our group when forging C–Si bonds, see ref. 7c. For the beneficial role of CsF in recent C–O bond-cleavage procedures, see: Schwarzer MC. Konno R. Hojo T. Ohtsuki A. Nakamura K. Yasutome A. Takahashi H. Shimasaki T. Tobisu M. Chatani N. Mori S.
J. Am. Chem. Soc. 2017;
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