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Strategies for expanding basic nitrogen tolerance in aliphatic C–H oxidations. (A) Imides are tolerated with no protection. (B,C) Tertiary amines can be masked via protonation as HBF4 salts or via BF3 complexation (not shown) to promote remote C–H oxidation. (D) Amides and lactams (not shown) can be masked as imidate salts to promote remote C–H oxidations.
