Table 2.

Reactions between benzyne and other enol ethers or vinylene carbonate.^[a]

Entry	Reactant	Product	Time (h), yield
1			2: 2 h, 72%
2			3: 6 h, 69%
3			4a, 4b: 3 h, 48% 1:1 mixture
4			5: 1 h, 50%[b]
5		NA[c]	–
6		NA[c]	– [d]
7			6: 2 h, 84%

^[a]Reactions were conducted at a 0.125 m concentration of 2-(trimethylsilyl)phenyl triflate in MeCN, in the presence of 1.2 equiv. of the enol ether (or vinylene carbonate), 2 equiv. of CsF, and 2 equiv. of 18-Cr-6 at room temperature.

^[b]Yield obtained with 3 equiv. of ethyl vinyl ether.

^[c]n.a.: not applicable.

^[d]About 86% of the glycal was recovered.