Synthesis and Structure of
Group IV Distanna[2]metallocenophanes
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Abstract
1,2-Dichloro-1,1,2,2-tetra-<i>tert</i>-butyldistannane
reacts with 2 equiv of sodium cyclopentadienide to give a bis(cyclopentadienyl)distannane.
Subsequent dilithiation with lithium diisopropylamide and reactions
with suitable metal halides yield [(C<sub>5</sub>H<sub>4</sub>Sn<i>t</i>Bu<sub>2</sub>)<sub>2</sub>MCl<sub>2</sub>] (M = Ti, Zr,
Hf). The group 4 <i>ansa</i>-metallocenes have all been
fully characterized by means of multinuclear NMR spectroscopy, elemental
analysis, and X-ray diffraction
