Zirconium-catalysed reaction of alkynyl halides with EtMgBr produced cyclobutene derivatives in which two carbon–carbon bonds were formed on the ethyl moiety of EtMgBr via an ethylene group in a catalytic cycle.
K. Kasai, Y. Liu, R. Hara and T. Takahashi, Chem. Commun., 1998, 1989 DOI: 10.1039/A804697B
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