Abstract
Reaction of the compound Cp ∗ TiMe 3 ( Cp ∗ = η 5- penthamethylcyclopentadienyl ) with the potent Lewis acid B(C 6F 50 3 results in methyl carbanion abstraction from the titanium and formation of the corresponding complex Cp ∗ TiMe 2(μ-Me)B(C 5F 5) 3, in which a methyl group bridges the titanium and boron atoms. The isotopically labelled compounds Cp ∗Ti(CH 2D) 3, Cp ∗Ti(CH 2D) 2(μ-CH 2D)B(C 6F 5) 3, Cp ∗ Ti( 13CH 3) 3, and Cp ∗ Ti( 13CH 3) 2(μ- 13CH 3)B(C 6F 5) 3 have also been prepared to provide NMR probes of the possibility of α-agostic bonding in these compounds, and while the answer appears to be ‘no’, a caveat on the use of this type of experiment is proposed. The compounds Cp ∗TiMe 3 and Cp ∗TiMe 2(μ-Me)B(C 6F 5) 3 react further to form the novel but unstable methyl-bridged species [Cp ∗TiMe 2(μ-Me)TiMe 2Cp ∗][MeB(C 6F 5) 3], which has been characterized by 1H and v 13C( 1H) NMR spectroscopy.
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