Synthesis of <i>ansa</i>-Dimethylsilanediyl−dicyclopentadienyl− zirconacyclopent-3-yne, Me<sub>2</sub>Si(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)<sub>2</sub>Zr(η<sup>4</sup>-H<sub>2</sub>C<sub>4</sub>H<sub>2</sub>), and Its Reactions with Ni(0) and B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub><sup>†</sup>
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The synthesis and reactions of ansa-dimethylsilanediyl−dicyclopentadienyl−zirconacyclopent-3-yne, Me2Si(η5-C5H4)2Zr(η4-H2C4H2) (7), are described. Complexation by Ni(0) complexes gives an external coordination of the triple bond and formation of the complex Me2Si(η5-C5H4)2Zr[μ(η4-H2C4H2)]Ni(PPh3)2 (8), representing a μ-“cis”-complexation of 1,2,3-butatrienes, which is described and compared with the coordination of similar complexes. The reaction of complex 7 with B(C6F5)3 results in ring opening of the 1-zirconacyclopent-3-yne and formation of the zwitterionic complex [Me2Si(η5-C5H4)2Zr]+−CH2C⋮CCH2−[B-(C6F5)3] (9), with the but-2-yne-1,4-diyl ligand bridging the zirconocenium center and the formed boranate. All complexes were characterized by X-ray analysis.
