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Keywords:

  • 1,5-hydride shift;
  • C[BOND]H activation;
  • catalysis;
  • Lewis acids
Thumbnail image of graphical abstract

Access allowed: A Lewis acid catalyzed 1,5-hydride shift is the key step in the direct functionalization of sterically congested C(sp3)[BOND]H bonds. This new method complements the existing transition-metal-mediated reactions that are limited to the functionalization of more accessible C[BOND]H bonds.