Table 1. Different hydroxylation approaches12^{, c} .

	Catalyst a	–OH source	Yield
1	PdCl2/Pd(OAc)2	TBHP (4 eq.)	0
2	PdCl2	H2O2 (4 eq.)	0
3	PdCl2	NHPI (2 eq.)	0
4	Cu(OAc)2	(PhCO)2O (2 eq.), HFIP (1 mL)	0
5	PdCl2/Pd(OAc)2	TEMPO (2 eq.)	0
6	Cu(OAc)2	TBAI(2 eq.), Ag2CO3(2 eq.)	0
7	PdCl2	K2S2O8 (2 eq.), CF3COOH (0.5 mL)	0
8	Pd(OAc)2	Na2S2O8 (2 eq.); dioxane (1 mL)	0
9 b	Pd(OAc)2	PhI(TFA)2(4 eq.), (CF3CO)2O	11
10	Pd(OAc)2	PhI(TFA)2 (4 eq.), HFIP (1 mL)	78

^aCatalyst loading 10 mol%.

^b0.5 mL of (CF₃CO)₂O added.

^c70 °C was maintained for all the reactions; all the reactions were performed on a 0.2 mmol scale.