Synthesis and characterization of alkyls (LAlMe2)-Al-1 (1), (LAlMe2)-Al-2 (2) and (LAlBu2)-Al-2-Bu-i (3) with O,C,O-chelating ligands L-1 and L-2 [L-1 = 2,6-(MeOCH2)(2)C6H3 and L-2 = 2,6-((BuOCH2)-Bu-t)(2)C6H3];