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aC–H di-bromination: NaBr (3 equiv.), Bu4NBr (1 equiv.), PhI(OAc)2 (3 equiv.), 3 : 1 HFIP : CH2Cl2, visible light (26 W CFL). C–H mono-chlorination: NaCl (3 equiv.), Bu4NCl (1 equiv.), PhI(OAc)2 (3 equiv.), 3 : 1 HFIP : CH2Cl2, UV light (300 nm). Isolated yields. 1H NMR yields in parenthesis.
