Reaction of Alkylzirconocene Cation Complexes with (R–CC–)
<sub>2</sub>
SiR
<sub>2</sub>
Reagents: Preparation of Heterodimetallic Compounds Containing a μ‐Alkynyl Ligand Bridge Between Zirconium and Silicon
methylzirconocene cation, employed as the [Cp2ZrCH3(THF)]+BPh4− reagent 1a reacts with (R′CC)2SiR2 substrates (6a–d) by means of carbometallation of an alkynyl group to yield the mixed metal ring systems 8a–d, containing both a 1,1-disubstituted μ-alkenyl and an alkynyl bridge between zirconium and silicon (e.g. shown by X-ray crystal structure analyses of complexes 8a and 8c). A similar addition reaction takes