In the presence of benzyne allylic Grignard reagents undergo three competitive reactions, viz. nucleophilic addition, concerted anionic 1,3-cycloaddition, and [2 + 2] cycloaddition.
J. Duboudin, B. Jousseaume and M. Pinet, J. Chem. Soc., Chem. Commun., 1977, 454 DOI: 10.1039/C39770000454
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