Formation and Reactivity of an Aluminabenzene Ligand at Pentadienyl-Supported Rare-Earth Metals.

The half-open rare-earth-metal aluminabenzene complexes [(1-Me-3,5-tBu2 -C5 H3 Al)(μ-Me)Ln(2,4-dtbp)] (Ln=Y, Lu) are accessible via a salt metathesis reaction employing Ln(AlMe4 )3 and K(2,4-dtbp). Treatment of the yttrium complex with B(C6 F5 )3 and tBuCCH gives access to the pentafluorophenylalane complex [{1-(C6 F5 )-3,5-tBu2 -C5 H3 Al}{μ-C6 F5 }Y{2,4-dtbp}] and the mixed vinyl acetylide complex [(2,4-dtbp)Y(μ-η1 :η3 -2,4-tBu2 -C5 H4 )(μ-CCtBu)AlMe2 ], respectively.