Table 1.

Hydrophenoxylation of unactivated internal alkynes.^a

Entry	Gold catalyst	Conv.b R = Ph Bu
1	None	0	0
2	(JohnPhos)AuCl	0	0
3	(t-BuXPhos)AuCl	0	0
4	(IMes)AuCl	0	0
5	(SIMes)AuCl	0	0
6	(IPr)AuCl	0	0
7	(SIPr)AuCl	0	0
8	1	98	95
9	2	62	48
10	2 + t-BuXPhos	79	60
11	3	77	70
12	4	47	50
13	5	63	48
14	6	64	45
15	7	86	92
16	8	89	95
17	9	90	91
18	1 Conventional heating	95	93

^aDiphenylacetylene or 5-decyne (0.28 mmol), 4-nitrophenol (0.56 mmol), catalyst (14.0 μmol, 5%), 130 °C, 20 min, no solvent, microwave irradiation. ^bBased upon ¹H NMR spectroscopy using anisole as an internal standard.