Reaction of a titanocene-alkyne complex with trialkylammonium tetraphenylborate - Novel synthesis and first crystal structural analysis of neutral-ligand-containing cationic titanocene(III) complexes [{Cp(2)Ti(L)(2)(+)}{BPh(4)(-)}]

The cationic d(1)-titanocene complexes [(Cp(2)Ti(L)(2)(+)}(BPh(4)(-)}] with L=THF (1) and pyridine (2) were very simply prepared by the reaction of [Cp(2)Ti(Me(3)SiC=CSiMe(3))] with trimethylammoniumtetraphenylborate via a 1e(-)-oxidation of the 14e(-)-Cp(2)Ti-unit to the paramagnetic titanium(III) complex under evolution of molecular hydrogen and the alkyne. Complex 2 is the first example of such a cationic-only neutral-ligand containing complexes without anionic ligands that has been characterized by an X-ray structure analysis.