Publications in Scientific Journals:
R. Lichtenberger, M. Puchberger, S. Baumann, U. Schubert:
"Modification of aluminum alkoxides with b-ketoesters: new insights into formation, structure and stability";
Journal of Sol-Gel Science and Technology,
50
(2009),
2;
130
- 140.
English abstract:
[Al(OiPr)2(β-ketoesterate)]2 and Al(β-ketoesterate)3 (β-ketoesterate = methyl, ethyl, iso-propyl, tertbutyl, allyl and 2-(methacryloyloxy)ethyl acetoacetate) were prepared by reaction of [Al(OiPr)3]4 with the corresponding b-ketoesters. Al(β-ketoesterate)3 derivatives were exclusively formed at room temperature, whereas elevated reaction temperatures, causing thermal de-oligomerization of [Al(OiPr)3]4, were necessary for the formation of [Al(OiPr)2(β-ketoesterate)]2. All compounds were characterized by NMR spectroscopy, and [Al(OiPr)2(tert-butyl acetoacetate)]2 by a single crystal structure analysis. The [Al(OiPr)2(β-ketoesterate)]2 derivatives are asymmetrically substituted dimers with one octahedrally and one tetrahedrally substituted aluminum atom, bridged by two isopropoxo groups, whereas the Al(β-ketoesterate)3 derivatives are monomers with octahedrally coordinated aluminum. Transesterification as a possible side reaction was only observed at elevated temperatures for Al(tert-butyl acetoacetate)3 in the presence of liberated iso-propanol.
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1007/s10971-008-1890-1
Created from the Publication Database of the Vienna University of Technology.