1. J. Am. Chem. Soc., 2003, 125 (30), pp 8980–8981
Huan Wang, Jie Huang, William D. Wulff, and Arnold L. Rheingold
The First Examples of a Meta-Benzannulation from the Reaction of Fischer Carbene Complexes with Alkynes
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http://dx.doi.org/10.1021/ja035428n