Structure characterisation of the organoaluminium intermediate resulting from the alkylation of a chelated carbonyl group. Molecular structure of the trinuclear [MeAl][C12H20O4][AlMe2]2 compound
Janusz Lewiński , Janusz Zachara
AbstractThe interaction of Me3Al with Me2Al(acac) results in the carbonyl alkylation of the chelating acetylacetonate ligand and formation of trinuclear complex [MeAl][C12H20O4][AlMe2]2 (1). The title compound has been characterised by 1H-and 27Al-NMR spectroscopy. The 1H-NMR spectra are consistent with the presence of two distinct isomers in an equimolar ratio: cis-1 and trans-1. Both isomers contain two methylated acac units bridged by three organoaluminium moieties: central five-coordinated methyl aluminium species and two terminal four-coordinated dimethylaluminium species. The structure of cis-1 has been confirmed by X-ray crystallography which revealed that the five-coordinated aluminium atom rises in almost ideal square pyramidal geometry. The role of the molar ratio of reactants is discussed.
|Journal series||Journal of Organometallic Chemistry, ISSN 0022-328X|
|Keywords in English||aluminium, Carbonyl alkylation, Crystal structure|
|Publication indicators||: 2006 = 2.332 (2) - 2007=2.097 (5)|
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