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

Abstract

The 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.
Author Janusz Lewiński ZKChM
Janusz Lewiński,,
- Department Of Catalysis And Organometallic Chemistry
, Janusz Zachara KChNTCS
Janusz Zachara,,
- Chair Of Inorganic Chemistry And Solid State Technology
Journal seriesJournal of Organometallic Chemistry, ISSN 0022-328X
Issue year1998
Vol560
No1–2
Pages89-94
Keywords in Englishaluminium, Carbonyl alkylation, Crystal structure
DOIDOI:10.1016/S0022-328X(98)00460-4
URL http://www.sciencedirect.com/science/article/pii/S0022328X98004604
Languageen angielski
File
Journal of Organometallic Chemistry1998.pdf 124.24 KB
Score (nominal)30
Publication indicators WoS Impact Factor: 2006 = 2.332 (2) - 2007=2.097 (5)
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