Aluminum(III) complexes containing O,O chelating ligand |
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| Authors: | Libor Dostál Roman Jambor Ivana Císařová Jan Merna Jaroslav Holeček |
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| Affiliation: | 1. Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, nám. ?s. Legií 565, CZ‐532 10, Pardubice, Czech Republic;2. Charles University in Prague, Faculty of Natural Science, Hlavova 2030, CZ‐128 40, Prague 2, Czech Republic;3. Institute of Materials Chemistry, Brno University of Technology, Purkyňova 118, CZ ‐ 612 00, Brno, Czech Republic |
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| Abstract: | The stoichiometric reactions of trimethylaluminum with 2,6‐(MeOCH2)2C6H3OH (LH) revealed compounds L3Al ( 1 ) and L2AlMe ( 2 ). On the other hand reaction of 1 equiv. of LH with trimethylaluminum did not lead to the formation of complex LAlMe2 ( 3 ), rather 2 together with Me3Al were observed as a result of a disproportionation of 3 . Compounds 1 and 2 were characterized by elemental analysis, 1H and 13C NMR spectroscopy and in the case of 1 by X‐ray diffraction. Derivative 2 underwent transmetalation with Ph3SnOH, giving LSnPh3 ( 4 ) as the result of a migration of ligand L from the aluminum to the tin atom. The identity of 4 was established by elemental analysis, 1H, 13C and 119Sn NMR spectroscopy and 1H, 119Sn HMBC experiments. The system 2 and B(C6F5)3 in a 1:1 molar ratio was shown to be active in the polymerization of propylene oxide and ε‐caprolactone. Copyright © 2007 John Wiley & Sons, Ltd. |
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| Keywords: | aluminum tin chelating ligands transmetalation polymerization |
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