Synthesis, structural analysis of the hetero-bimetallic complexes MMe[(O-2,4-tBu2C6H2-6-CH2)2(μ2-O-2,4-tBu2C6H2-6-CH2)N][Me2Al(μ2-OiPr)] [M = Zr, Hf] and their use in catalysis for ethylene polymerisation
作者:Yuki Takii、Akiko Inagaki、Kotohiro Nomura
DOI:10.1039/c3dt51172c
日期:——
The synthesis and structural analysis of the hetero-bimetallic M–Al complexes MMe[(O-2,4-tBu2C6H2-6-CH2)2(μ2-O-2,4-tBu2C6H2-6-CH2)N][Me2Al(μ2-OiPr)] [M = Zr, Hf], prepared from M(OiPr)[(O-2,4-tBu2C6H2)-6-CH2}3N] by treating with 1.0 equiv. of AlMe3, have been explored: these complexes exhibited catalytic activities for ethylene polymerisation in n-octane in the presence of methylaluminoxane (MAO)
的合成和结构分析的杂双金属M-铝络合物MME [(O-2,4-吨卜2 c ^ 6 ħ 2 -6-CH 2)2(μ 2 -O-2,4-吨卜2 c ^ 6 ħ 2 -6-CH 2)N] [我2的Al(μ 2 -O我PR)] [M =锆,铪],从M个制备(O我PR)[(O-2,4- t Bu 2 C 6 H 2)-6-CH 2 } 3 N]经1.0当量处理。的AlMe 3,已被探索:这些络合物在乙烯聚合反应中表现出催化活性。 正辛烷在甲基铝氧烷(MAO)的存在下。Zr-Al类似物显示出高催化活性,使聚合物具有单峰分子量分布。
Alternating Sequence Controlled Copolymer Synthesis of α-Hydroxy Acids via Syndioselective Ring-Opening Polymerization of <i>O</i>-Carboxyanhydrides Using Zirconium/Hafnium Alkoxide Initiators
challenges until now for lack of suitable catalysts/initiators. In this work, a highly syndioselective ROP of OCAs system as the first stereoselective example in this area is reported using zirconium/hafnium alkoxides as initiators with the highest Pr value up to 0.95. Furthermore, these initiators were successfully applied in the precisely alternating sequence controlled copolymerization of PheOCA and