Halogen-containing tetrametallic aluminium alkoxides

New halogen-containing tetrametallic aluminium alkoxides of formula [Al{(mu-OEt)(2)AlMeCl}(3)] (2-cis; 2-trans), and [Al{(mu-OEt)(2)AlBr(2)}(3)] (4), have been synthesized by combining Al(OEt)(3) and Me(2)AlCl (for 2) or EtAlBr(2) (for 4). They were fully characterized by ((1)H, (27)Al) NMR, IR, mp, elemental analysis, and single-crystal X-ray diffractometry. The chloride analogue of 4, [Al{(mu-OEt)(2)AlCl(2)}(3)] (3), prepared previously using a different route, was also prepared here by combining Al(OEt)(3) and EtAlCl(2).