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Issue 11, 2013
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Dinuclear aluminum complexes supported by amino- or imino-phenolate ligands: synthesis, structures, and ring-opening polymerization catalysis of rac-lactide

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Abstract

Two series of ligand precursors [2-OH-3-(CH2NR2)-5-MeC6H2]2CH2 (1: NR2 = NMe2; 2: NR2 = N(CH2)4; 3: NR2 = N(CH2)5; 4: NR2 = N(Me)Ph) and [2-OH-3-(CH[double bond, length as m-dash]NR)-5-MeC6H2]2CH2 (10: R = 2,6-Pri2C6H3; 11: R = p-MeC6H4; 12: R = p-ClC6H4; 13: R = p-MeOC6H4; 14: R = But) were prepared. These compounds reacted with AlMe3 to afford corresponding dinuclear aluminum complexes [AlMe2{2-O-3-(CH2NR2)-5-MeC6H2}]2CH2 (6: NR2 = NMe2; 7: NR2 = N(CH2)4; 8: NR2 = N(CH2)5; 9: NR2 = N(Me)Ph) and [AlMe2{2-O-3-(CH[double bond, length as m-dash]NR)-5-MeC6H2}]2CH2 (15: R = 2,6-Pri2C6H3; 16: R = p-MeC6H4; 17: R = p-ClC6H4; 18: R = p-MeOC6H4; 19: R = But). All the compounds were characterized by 1H and 13C 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.

Graphical abstract: Dinuclear aluminum complexes supported by amino- or imino-phenolate ligands: synthesis, structures, and ring-opening polymerization catalysis of rac-lactide

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Publication details

The article was received on 22 Oct 2012, accepted on 12 Dec 2012 and first published on 13 Dec 2012


Article type: Paper
DOI: 10.1039/C2DT32520A
Citation: Dalton Trans., 2013,42, 3860-3868
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    Dinuclear aluminum complexes supported by amino- or imino-phenolate ligands: synthesis, structures, and ring-opening polymerization catalysis of rac-lactide

    X. Yu and Z. Wang, Dalton Trans., 2013, 42, 3860
    DOI: 10.1039/C2DT32520A

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