Abstract

The chelating aluminum complex [{3,5-N-tBu2pz-N′−CH=C(SiMe3)}AlR1R2] [R1 = R2 = Me (2); R1 = R2 = H (3); R1 = R2 = I (4)] was prepared in modest yield from an organoaluminum dichloride precursor [{3,5-N-tBu2pz-N′−CH=C(SiMe3)}AlCl2] (1). Compounds 2 and 3 were obtained from the reaction of 1 with MeLi in Et2O or with LiAlH4 in THF, respectively. Reaction of 2 or 3 with I2 in toluene gave 4. In addition, the reaction of 1 with two equivalents of water yielded the hydrolyzed product H[3,5-N-tBu2pz-N′−CH=C(SiMe3)] (5). All compounds were characterized by elemental analysis, NMR spectroscopy, and mass spectrometry. The X-ray structure analysis shows that complex 2 exhibits one fused five-membered AlC2N2 ring and one pyrazolato ring system. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)

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