The intermolecular addition of in situ generated titanocene vinylidene complexes to alkynes gives titanacyclobutenes which undergo an insertion–rearrangement with tert-butyl isocyanide to afford allenylketenimines in high yield.
R. D. Dennehy and R. J. Whitby, J. Chem. Soc., Chem. Commun., 1992, 35 DOI: 10.1039/C39920000035
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