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3 Polish Journal of Chemistry

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How the Bonding Mode in Cyclopentadienylaluminum Complexes Influences the Cp– Ligand Aromaticity

Zachara J., Madura I., Kunicki A.

Polish Journal of Chemistry

2007

Vol. 81, nr 5-6

745-755

The substantial influence of floating Cp–Al bond-modes from ni 5(pi) to ni 1(omega) on the Cp– ligand’s aromaticity was discussed basing on the crystal data of organoaluminum complexes and DFT calculations (B3LYP/6-311G**) performed for model compounds. The aromaticity of cyclopentadienyl moiety was characterized by the HOMA index. The spread of HOMA values from 0.8 to –0.5 indicated the electronic structure of the cyclopentadienyl ligand bonded to aluminum center can be regarded as an intermediate between the highly aromatic, uncomplexed cyclopentadienyl anion Cp– and the antiaromatic structure of cyclopentadiene CpH.

Dicyclopentadienylaluminium Chiral Alkoxides

Kunicki A., Cebulski A., Leszczyńska K., Kowalczyk K., Zachara J.

Polish Journal of Chemistry

2006

Vol. 80, nr 3

439-444

The reactions of Cp3Al with rac-1-phenyl-1-propanol, rac-2-phenyl-1-propanol and rac-1-phenyl-2-propanol lead to the formation of dicyclopentadienylalkoxy bridged dimers containing chiral alkoxy groups; (R,S) and (R*,R*) diastereoisomerswere found in the reaction mixture. The 1H and 13C NMR study showed a differentiation of signal patterns for diastereoisomers depending on the symmetry of a compound and of an anisotropic character of the chiral ligand.

Alkoxymethylaluminum Complex with Cyclopentadienyl Ligand-Synthesis and Characterization

Szumacher S., Leszczyńska K., Kunicki A., Madura I., Zachara J.

Polish Journal of Chemistry

2005

Vol. 79 / nr 11

1773-1779

A series of novel aluminum alkoxide derivatives, [Cp(Me)Al-m-OR]2, (where R = Me 1,Et 2, iBu 3, tBuCH2 4, iPr 5, tBu 6) has been prepared by reacting Me(Cl)AlOR with CpNa. All the compounds were characterized by multinuclear NMR, elemental analysis and molecular weight determinaion cryoscopically in benzene.