Yang Wang, Wei Zhao, Dongtao Liu
May 29, 2012
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Organometallics
Abstract
The N,O-bidentate pyridyl functionalized alkoxy ligands 2-(6-methyl-2-pyridinyl)-1,1-dimethyl-1-ethanol (L1–H) and 2-(6-methyl-2-pyridinyl)-1,1-diphenyl-1-ethanol (L2–H) have been prepared by treatment of acetone and benzophenone with monolithiated 2,6-lutidine. Deprotonolysis of the ligands L1–H and L2–H with 1 equiv of MgnBu2 and ZnEt2 in toluene by releasing butane and ethane, respectively, gave the corresponding dimeric metal-monoalkyl complexes [L1MgnBu]2 (1), [L2MgnBu]2 (2), [L1ZnEt]2 (3), and [L2ZnEt]2 (4). Complexes 1–4 were characterized by 1H and 13C NMR spectroscopy analysis, and the molecular structures of 1, 3, and 4 were further confirmed by X-ray diffraction analysis. The investigation of the catalytic behavior of these complexes toward e-caprolactone (e-CL) and l-lactide (l-LA) polymerizations showed that the Mg-based complexes gave higher activity than those attached to zinc metal, probably owing to the greater ionic character of the magnesium metal. Remarkably, the magnesium complex 2 ex...