Synthesis,characterization, and catalytic application of a zinc(II) complex bearing a pyrazole-based ligand |
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| Authors: | Youn K Kang Jong Hwa Jeong Na Young Lee Young Tak Lee Hyosun Lee |
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| Institution: | 1. Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-747, Republic of Korea;2. Department of Chemistry, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu-city 702-701, Republic of Korea |
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| Abstract: | The reaction between ZnCl2 and N,N-bis(3,5-dimethyl-1H-pyrazol-1-yl)methyl]-1-phenylethylamine (bdmppea) affords (bdmppea)ZnCl2], whose structure has been determined by X-ray crystallography. The (bdmppea)ZnEt2] complex in situ prepared by the reaction between bdmppea] and ZnEt2 exhibited high activity toward the polymerization reaction of rac-lactide at room temperature. However, its activity decreased sharply with decreasing temperature. Stereospecificity of this catalyst characterized by heterotacticity (Pr) was determined by homonuclear decoupled NMR spectroscopy, which value was ∼0.58. |
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| Keywords: | Pyrazole Zinc Polylactide Polymerization Bio-compatible polymer |
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