Optimization of reaction conditions^a.

Entry	Catalyst	Conv.b (%)	2a Sel.b (%)	3a Sel.b (%)	UR (%) (H2O2)
1c	None	3	99	0	2.5
2c	TeW6Cu	89	86	14	64
3c	Te2W8Cu2	99	96	4	80
4d	Te2W8Cu2	91	96	4	73
5e	TeW6Cu	99	7	93	74
6e	Te2W8Cu2	99	1	99	79
7f	Te2W8Cu2	99	21	79	79

^aReaction conditions: 1a (0.5 mmol), catalyst (0.17 mol%), solvent (1 ml).

^bYields determined by GC analysis using 1-adamantanol as an internal standard.

^cH₂O₂ (30%) (1.2 equiv.), MeOH or EtOH (1 ml), 8 h.

^dH₂O₂ (30%) (1.0 equiv.), MeOH or EtOH (1 ml), 8 h.

^eH₂O₂ (30%) (2.5 equiv.), MeCN (1 ml), 6 h.

^fH₂O₂ (30%) (2.0 equiv.), MeCN (1 ml), 8 h. UR = utilization rate.