Monomeric or Dimeric Aluminum Complexes as Catalysts for Cycloaddition between CO
<sub>2</sub>
and Epoxides
作者:So Han Kim、Sang Yeop Han、Jeong Hee Kim、Yi Young Kang、Junseong Lee、Youngjo Kim
DOI:10.1002/ejic.201500184
日期:2015.5
systematically designed to make monomeric or dimericaluminumcomplexes. Comparison of the catalytic properties of the aluminumcomplex containing the tetradentate ligand with those of the two related aluminumcomplexes containing the bidentate ligand under the same conditions revealed that the first system showed higher activity than the other two for cycloadditionbetween CO2 and epoxides in the presence of PPNCl
合成了含有脂肪族四齿配体 L1 (HOCMe2CH2NMeCH2CH2NMeCH2CMe2OH) 的单体铝配合物,并在 PPNCl 作为助催化剂的情况下用作 CO2 和环氧化物之间的环加成反应的催化剂。为了检查与铝中心配位的配体 L1 对环加成活性的影响,系统设计了对应于 L1 一半的新配体 HOCMe2CH2NMe2 来制备单体或二聚体铝配合物。在相同条件下比较含有四齿配体的铝配合物与含有双齿配体的两种相关铝配合物的催化性能表明,第一种体系在 CO2 和环氧化物之间的环加成反应中表现出比其他两种更高的活性PPNCl,
Synthesis, X-ray structures, and controlled ring opening polymerization behavior of l-lactide using titanium complexes chelated by tetradentate diamine–diethanolate ligand
作者:So Han Kim、Da Jung Kim、Min Jeong Go、Young Soo Ko、Junseong Lee、Youngjo Kim
DOI:10.1039/c2dt31357j
日期:——
The synthesis and characterization of LTi(O-i-Pr)2 (1) and LTiCl2 (2) complexescontaining a new [ONNO]-type tetradentate diamine–diethanolate ligand such as (HOCMe2CH2NMeCH2CH2NMeCH2CMe2OH) (LH22) was achieved. Single-crystal X-ray analyses revealed that monomeric complexes 1 and 2 had pseudo-C2 and pseudo-C1 symmetric distorted octahedral geometry, respectively. Interestingly, complex 1 has fac–fac