Synthesis, characterization, and catalytic application of a zinc(II) complex bearing a pyrazole-based ligand

Youn K. Kang; Jong Hwa Jeong; Na Young Lee; Young Tak Lee; Hyosun Lee

doi:10.1016/j.poly.2010.05.009

Synthesis, characterization, and catalytic application of a zinc(II) complex bearing a pyrazole-based ligand

Youn K. Kang, Jong Hwa Jeong, Na Young Lee, Young Tak Lee, Hyosun Lee

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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 diethyl derivative [(bdmppea)ZnEt₂] complex in situ prepared by the reaction between [bdmppea] and ZnEt₂ exhibited high activity toward the polymerization reaction of rac-lactide with conversion of 93% at room temperature with heterotacticity (P_r) around value of 0.58. 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)ZnEt ₂] 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 (P_r) was determined by homonuclear decoupled NMR spectroscopy, which value was ∼0.58.

Original language	English
Pages (from-to)	2404-2408
Number of pages	5
Journal	Polyhedron
Volume	29
Issue number	12
DOIs	https://doi.org/10.1016/j.poly.2010.05.009
State	Published - 11 Aug 2010

Keywords

Bio-compatible polymer
Polylactide
Polymerization
Pyrazole
Zinc

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title = "Synthesis, characterization, and catalytic application of a zinc(II) complex bearing a pyrazole-based ligand",

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 diethyl derivative [(bdmppea)ZnEt2] complex in situ prepared by the reaction between [bdmppea] and ZnEt2 exhibited high activity toward the polymerization reaction of rac-lactide with conversion of 93% at room temperature with heterotacticity (Pr) around value of 0.58. 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)ZnEt 2] 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.",

keywords = "Bio-compatible polymer, Polylactide, Polymerization, Pyrazole, Zinc",

author = "Kang, {Youn K.} and Jeong, {Jong Hwa} and Lee, {Na Young} and Lee, {Young Tak} and Hyosun Lee",

year = "2010",

month = aug,

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doi = "10.1016/j.poly.2010.05.009",

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T1 - Synthesis, characterization, and catalytic application of a zinc(II) complex bearing a pyrazole-based ligand

AU - Kang, Youn K.

AU - Jeong, Jong Hwa

AU - Lee, Na Young

AU - Lee, Young Tak

AU - Lee, Hyosun

PY - 2010/8/11

Y1 - 2010/8/11

N2 - 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 diethyl derivative [(bdmppea)ZnEt2] complex in situ prepared by the reaction between [bdmppea] and ZnEt2 exhibited high activity toward the polymerization reaction of rac-lactide with conversion of 93% at room temperature with heterotacticity (Pr) around value of 0.58. 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)ZnEt 2] 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.

AB - 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 diethyl derivative [(bdmppea)ZnEt2] complex in situ prepared by the reaction between [bdmppea] and ZnEt2 exhibited high activity toward the polymerization reaction of rac-lactide with conversion of 93% at room temperature with heterotacticity (Pr) around value of 0.58. 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)ZnEt 2] 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.

KW - Bio-compatible polymer

KW - Polylactide

KW - Polymerization

KW - Pyrazole

KW - Zinc

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DO - 10.1016/j.poly.2010.05.009

M3 - Article

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EP - 2408

JO - Polyhedron

JF - Polyhedron

IS - 12

ER -

Synthesis, characterization, and catalytic application of a zinc(II) complex bearing a pyrazole-based ligand

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