Highly Active <i>ansa</i>-(Fluorenyl)(amido)titanium-Based Catalysts with Low Load of Methylaluminoxane for Syndiotactic-Specific Living Polymerization of Propylene
作者:Yanjie Sun、Bo Xu、Takeshi Shiono、Zhengguo Cai
DOI:10.1021/acs.organomet.7b00415
日期:2017.8.28
ansa-Dimethylsilylene(fluorenyl)(amido)titaniumcomplexesbearing various electron-donating substituents are synthesized and applied to propylenepolymerization by the use of MMAO/2,6-di-tert-butyl-4-methylphenol as a cocatalyst. The complexes containing adamantylamido ligands (1a,b) show unexpectedly high activity (31150 kg of polymer (mol of Ti)−1 h–1) with a low Al:Ti ratio of 20. The catalysts
安莎-Dimethylsilylene(芴基)(酰氨基)钛络合物承载各种电子取代基被合成和通过使用MMAO / 2,6-二-施加到丙烯聚合叔丁基-4-甲基苯酚作为助催化剂。含有金刚烷酰胺基配体(1a,b)的配合物显示出乎意料的高活性(31150 kg聚合物(Ti摩尔)-1 h –1),且Al:Ti比为20。生产丙烯-乙烯嵌段共聚物。
New Metallocene Catalyst Having an Indenyl Group and a Fluorenyl Group for Ethylene–Polar Monomer Copolymerization
作者:Jun-ichi Imuta、Yoshihisa Toda、Norio Kashiwa
DOI:10.1246/cl.2001.710
日期:2001.7
New stereorigid bridged zirconocene having an indenyl group and a fluorenyl group as ligand was synthesized and investigated as an ethylene/1-hydroxy-10-undecene copolymerization catalyst. This catalyst using MAO as a cocatalyst promoted polymerization to produce copolymers having high molecular weight (Mw:121000) and high polar monomer content (36.7 mol%), displaying higher polymerization activities at higher temperature.
合成了以茚基和芴基为配体的新型立体配位桥接锆烯,并将其作为乙烯/1-羟基-10-十一烯共聚催化剂进行了研究。这种催化剂以 MAO 为助催化剂,可促进聚合,生成高分子量(Mw:121000)和高极性单体含量(36.7 摩尔%)的共聚物,在较高温度下显示出较高的聚合活性。
The synthesis, characterization and polymerization behavior of ansa cyclopentadienyl fluorenyl complexes; the X-ray structures of the complexes [(C13H8)SiR2(C5H4)]ZrCl2 (RMe or Ph)
作者:Konstantinos Patsidis、Helmut G Alt、Wolfgang Milius、Syriac J Palackal
DOI:10.1016/0022-328x(95)05788-q
日期:1996.2
The preparation and characterization of the ansa metallocene complexes [(C13H8)ER(2)(C5H4)]ZrCl2, [(2,7-(t)Bu(2)C(13)H(5))-SiR(2)(C5H4)ZrCl2 and [(2,7-(t)Bu(2)C(13)H(6))SiR(2)(C13H8)]ZrCl2 (E=Si or Ge; R=Me or Ph) are reported. The crystal structures of [(C(13)H(8)SiR(2)(C5H4)]ZrCl2 (R=Me, or Ph) have been determined and are discussed. The complexes are compared in respect to the polymerization behavior of propylene.
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作者:I. E. Nifant"ev、I. A. Kashulin、V. V. Bagrov、S. K. Abilev、I. K. Lyubimova
DOI:10.1023/a:1012745325790
日期:——
Dihetaryldimethylsilanes and dihetarylmethanes containing indeno[2,1-b]indolyl and indeno[2, 1-b]pyrrolyl fragments were synthesized. Their mutagenic activity was tested according to Ames with standard test strains Salmonella typhimurium TA 1537, TA 98, and TA 100.
Substituent Effects of <i>tert</i>-Butyl Groups on Fluorenyl Ligand in Syndiospecific Living Polymerization of Propylene with <i>a</i><i>nsa</i>-Fluorenylamidodimethyltitanium Complex
applied for propylene polymerization using dried modified methyaluminoxane (dMMAO) as a cocatalyst at 0 and 25 °C. The introduction of tert-butyl substituents to the fluorenyl ligand improved the activity more than 3 times regardless of the position of the substituents. The postpolymerization testified that both catalytic systems conducted the propylene polymerization in a living manner at both 0 and