Table 3.

Gold(I)‐catalyzed oxidative reaction of propargyl cycloheptatriene (11) to give 1‐formylbarbaralane (12).

Entry	[Au]	Oxid.	Time [h]	12 Yield [%][a]
1	A	Ox1	18	27
2	A	Ox2	15	–
3	A	Ox3	18	5
4	A	Ox4	15	–
5	B′	Ox1	17	91 (87)[b]
6	B′	Ox3	17	7
8	D	Ox1	4	90 (87)[b]
9	D	Ox3	18	8
10	E′	Ox1	6	92
11	E′	Ox3	24	–

[a] Yields determined by ¹H NMR spectroscopy using mesitylene as an internal standard. [b] Yield of isolated products.