Reaction of silazirconacyclopentene formed from zirconium–silene complex and alkyne with isocyanide

The reaction of silazirconacyclopentene (3), which was formed from zirconium–silene complex 1 and diarylacetylene (5), with tert-butyl isocyanide afforded iminosilazirconacyclohexene (7). Treatment of iminosilazirconacyclohexene (7) with HCl–Et2O gave the imino-zirconium complex 6, whose structure was confirmed by X-ray crystallography. The reaction was monitored by 1H-NMR spectroscopy.