Table 1. Chiral ligand- vs. chiral base-catalyzed asymmetric C(sp³)–H arylation ^a .

Entry	L	Brønsted acid RYO2H	e.r. (yield)	ref.
1	Chiral NHC or phosphine	Achiral RCO2H	Up to 99 : 1	Kündig5
			Up to 97 : 3	Kagan6
			Up to 98 : 2	Cramer7a
2	None		65 : 35 (Traces)	Kagan6
3	IPr		71 : 29 (20%)	Cramer7a
4	PCy3	3,3′-CF3Ph-BPA	Up to 98 : 2	This work

^aIPr = 1,3-bis(2,6-diisopropylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene; BPA = binol-derived phosphoric acid.