Reacting triethyl aluminum and diethyl aluminum chloride with the chelating bisphenol ligands mdtbpH2 and mmcpH2 [mmcpH2: 2,2'methylenebis(4-methyl-6-(1-methyl-cyclohexyl)phenol); mdtbpH2: 2,2'-methylenebis(4,6-di-tet-t-butyl-phenol)] afforded monomeric and dimeric aluminum bisphenoxides with reactive Al-Cl and Al-C2H5 moieties. We present here the X-ray structure determination of some of the isolated compounds as well as the preliminary catalytic tests in copolymerization reactions with cyclohexene oxide and carbon dioxide. (c) 2006 Elsevier B.V. All rights reserved.