Synthesis of dinuclear aluminum complexes bearing bis-phenolate ligand and application in ring-opening polymerization of ε-caprolactone?
New Journal of Chemistry Pub Date: 2017-02-07 DOI: 10.1039/C6NJ03818B
Abstract
The stoichiometric reaction of bis-phenolate ligands with AlMe3 afforded zwitterionic aluminum complexes Al1-Al3, which were characterized by NMR spectroscopy and elemental analysis. The solid state structure of Al2 was determined by single-crystal X-ray diffraction, which revealed a dinuclear feature. Two Al centers were bridged by two ligands and thus formed an unusual large 24-membered-ring metallacycle. In the presence of BnOH, Al1-Al3 were efficient for the ring-opening polymerization of ε-caprolactone in a controlled manner, and the efficiency was affected by substituents on the ligands. The polymerizations exhibited a feature of immortal catalysis with an excess of BnOH.
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Journal Name：New Journal of Chemistry
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CAS no.: 89640-58-4
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