Synthesis, properties, and molecular structures of alkylaluminium aminoalkoxide chlorides

Hecht, E., Gelbrich, T., Thiele, K. H. and Sieler, J. (2000) Synthesis, properties, and molecular structures of alkylaluminium aminoalkoxide chlorides. Zeitschrift Fur Anorganische Und Allgemeine Chemie, 626 (1), 180-186. (doi:10.1002/(SICI)1521-3749(200001)626:1<180::AID-ZAAC180>3.0.CO;2-O).

Abstract

Alkylaluminium aminoalkoxide chlorides [R(Cl)AlOR*] 1-3 have been obtained from the reaction of dialkyl aluminium chlorides R₂AlCl with the respective aminoalkohol HOR* (1: R = Et, OR* = dimethylamino-1-propanol; 2: R = Me, OR* = (+);(-)-dimethylamino-2-propanol; 3: R = Me, OR* = (S)-N-methyl-2-pyrrolidinyl-methanol). The reaction between dimethylaluminium chloride and (S)-α,α-diphenyl-2-pyrrolidinyl-methanol (OR* = Dpm) yielded, by contrast, the ionic {[MeAl(OR*)₂AlMe₂]⁺ [MeAlCl₃]^-} complex (4). 1-4 have been characterised by ¹H,¹³C and ²⁷Al-NMR spectroscopy. Crystal structures of 1 and of the 1:1 solvate of 4 with Et₂O have been determined by X-ray methods and the absolute structure of 4 was confirmed by refinement of the Flack-parameter. The dimeric molecules of 1 are composed of two chelating rings linked via an almost planar Al₂O₂ unit and pentacoordination is observed about aluminium. In contrast, each of the two crystallographically independent cation molecules of 4 contains one four- and one five-coordinate metal centre.

This record has no associated files available for download.

Contributors

Download statistics