Aluminium cyclopentadienyl complexes

Reduction of cobalticenium halides by sodium borohydride in aqueous ethanol or by lithium aluminium hydride in tetrahydrofuran gives the neutral diamagnetic complex [Co(CsHe)(C6H6)](XXIV) in which one ir-cyclopentadienyl anion has been converted into cyclopentadiene (99) ... 

Novel rathenium complexes with carborane ligands were employed as efficient catalysts for controlled polymer synthesis via Atom Transfer Radical Polymerization (ATRP) mechanism. The ability of carborane ligands to stabihze high oxidation states of transition metals allows the proposed catalysts to be more active than their cyclopentadienyl counterparts. The proposed catalysts do not reqnire additives such as aluminium alkoxides. It was shown that introdnction of amine additives into the polymerization mixture leads to a dramatic increase of polymerization rate leaving polymerization controlled. The living nature of polymerization was proved via post-polymerization and synthesis of block copolymers. 

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