title: Dinuclear aluminum complexes supported by amino- or imino-phenolate ligands: synthesis, structures, and ring-opening polymerization catalysis of rac-lactide.
abstract: Two series of ligand precursors [2-OH-3-(CH(2)NR(2))-5-MeC(6)H(2)](2)CH(2) (1: NR(2) = NMe(2); 2: NR(2) = N(CH(2))(4); 3: NR(2) = N(CH(2))(5); 4: NR(2) = N(Me)Ph) and [2-OH-3-(CH=NR)-5-MeC(6)H(2)](2)CH(2) (10: R = 2,6-Pr(2)(i)C(6)H(3); 11: R = p-MeC(6)H(4); 12: R = p-ClC(6)H(4); 13: R = p-MeOC(6)H(4); 14: R = Bu(t)) were prepared. These compounds reacted with AlMe(3) to afford corresponding dinuclear aluminum complexes [AlMe(2){2-O-3-(CH(2)NR(2))-5-MeC(6)H(2)}](2)CH(2) (6: NR(2) = NMe(2); 7: NR(2) = N(CH(2))(4); 8: NR(2) = N(CH(2))(5); 9: NR(2) = N(Me)Ph) and [AlMe(2){2-O-3-(CH=NR)-5-MeC(6)H(2)}](2)CH(2) (15: R = 2,6-Pr(2)(i)C(6)H(3); 16: R = p-MeC(6)H(4); 17: R = p-ClC(6)H(4); 18: R = p-MeOC(6)H(4); 19: R = Bu(t)). All the compounds were characterized by (1)H and (13)C NMR spectroscopy and elemental analyses. Complexes 6 and 16 were additionally characterized by single crystal X-ray diffraction techniques. Catalysis of the aluminum complexes towards the ring-opening polymerization of rac-lactide was evaluated in the presence of benzyl alcohol. All the polymerization reactions proceed in a controlled manner.
authors: CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors: Xiao-Feng
authors: XF
authors: Yu
authors: Zhong-Xia
authors: ZX
authors: Wang
mesh_terms: D017607:Aluminum Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D002384:Catalysis; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D004146:Dioxanes / Q000138:chemical synthesis / Q000737:chemistry*; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D010636:Phenols / Q000138:chemical synthesis / Q000737:chemistry*; D058105:Polymerization
chemical_list: D017607:Aluminum Compounds; D056831:Coordination Complexes; D004146:Dioxanes; D010636:Phenols; C091880:dilactide