Table 1.

Synthesis and alkyne C(sp) ¹³C NMR chemical shifts of gold π-alkyne complexes 1a–1e and 2a–2c.

entry	L	alkyne	complex	yield (%)a	δ C=C
1	P(t-Bu)2(o-biphenyl)		1a	98	91.4
2	P(t-Bu)2(o-biphenyl)		1b	96	88.7, 75.4
3	P(t-Bu)2(o-biphenyl)		1c	90	98.3, 87.0
4	P(t-Bu)2(o-biphenyl)		1d	91	84.9
5	P(t-Bu)2(o-biphenyl)		1e	(92)	90.6, 86.0
6	IPr		2a	94	87.2
7	IPr		2b	99	86.9, 83.5
8	IPr		2c	(97)	81.5

^aIsolated yield. Values in parentheses refers to ¹H NMR yield for in situ generated complexes.