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Issue 24, 2014
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Dinuclear magnesium, zinc and aluminum complexes supported by bis(iminopyrrolide) ligands: synthesis, structures, and catalysis toward the ring-opening polymerization of ε-caprolactone and rac-lactide

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Abstract

Synthesis and characterization of novel dinuclear magnesium, zinc and aluminum complexes supported by bis(iminopyrrolide) ligands and their catalysis toward the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) and rac-lactide (rac-LA) were carried out. The ligand precursors [(5-But-2-C4H2NH)CH[double bond, length as m-dash]N(CH2)2]2NH (H2LBu, 1) and [(2-C4H3NH)CH[double bond, length as m-dash]N(CH2)2]2NH (H2LH, 2) were prepared by condensation of diethylene triamine with 5-tert-butyl-1H-pyrrole-2-carbaldehyde and 1H-pyrrole-2-carbaldehyde, respectively. Treatment of 1 with 2 equiv. of BunMgOBn in toluene at 70 °C produced dinuclear magnesium complex [(μ-OBn)2Mg2LBu] (3). Similar treatment of 1 with EtZnOBn generated [(μ-OBn)2Zn2LBu] (4). Reaction of 2 with 2 equiv. of Me2AlOBn in toluene at 70 °C afforded aluminum complex [Me2Al(μ-OBn)2AlLH] (5). Complexes 3–5 were characterized by 1H and 13C NMR spectroscopy, elemental analyses, and single crystal X-ray diffraction techniques. Each of complexes 3–5 is active for the ROP of ε-CL and rac-LA. Kinetic studies of the polymerization reactions were performed.

Graphical abstract: Dinuclear magnesium, zinc and aluminum complexes supported by bis(iminopyrrolide) ligands: synthesis, structures, and catalysis toward the ring-opening polymerization of ε-caprolactone and rac-lactide

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Publication details

The article was received on 10 Feb 2014, accepted on 18 Mar 2014 and first published on 19 Mar 2014


Article type: Paper
DOI: 10.1039/C4DT00431K
Citation: Dalton Trans., 2014,43, 9126-9135
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    Dinuclear magnesium, zinc and aluminum complexes supported by bis(iminopyrrolide) ligands: synthesis, structures, and catalysis toward the ring-opening polymerization of ε-caprolactone and rac-lactide

    W. Kong and Z. Wang, Dalton Trans., 2014, 43, 9126
    DOI: 10.1039/C4DT00431K

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