Bis(propynyl)zirconocene 1 undergoes alkynyl ligand coupling upon treatment with B(C6F5)3; the resulting (C5H5)2Zr(µ-2,4-hexadiyne)BAr3 betaine 2 reacts with benzonitrile to give a Zr/B-bridging methylenecyclopropene derivative 5 that is formed via intramolecular alkyne insertion into a Zr–C(sp2)σ bond; complex 5 was characterized by single-crystal X-ray diffraction.
B. Temme, G. Erker, R. Fröhlich and M. Grehl, J. Chem. Soc., Chem. Commun., 1994, 1713 DOI: 10.1039/C39940001713
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