Iron Phosphinimide and Phosphinimine Complexes: Catalyst Precursors for Ethylene Polymerization
作者:Luc LePichon、Douglas W. Stephan、Xiaoliang Gao、Qinyan Wang
DOI:10.1021/om011041m
日期:2002.4.1
-O) 5. These species have also been evaluated as catalysts for the polymerization of ethylene and copolymerization of ethylene/octene. These species were found to be single-site catalysts even under rather demanding conditions (50−160 °C, 100−300 psig ethylene), although the activities are generally low. Compound 5 affords polymer similar to that produced by 3, suggesting that MAO dehydrates 5 generating
Phosphinimine-substituted boranes and borenium ions
作者:Michael H. Holthausen、Ian Mallov、Douglas W. Stephan
DOI:10.1039/c4dt02406k
日期:——
presented. In addition, in some cases a Lewis acid mediated exchange of Si-bonded methyl groups for a chloro-substituent was observed (5a,b). Based on the phosphinimine-substituted boranes, a series of boreniumion salts (8b–d, 9c, 10b–d) was prepared upon reaction with MeOTf. All compounds were fully characterized and a number of molecular structures were determined by X-ray diffraction.
使膦亚胺R 3 PNSiMe 3(R = t -Bu :1a,R = Cy:1b,R = Et:1c,R = Ph:1d)与一系列氯和氟硼烷(9Cl-9-BBN,( C 6 F 5)2 BCl,PhBCl 2和Mes 2 BF )通过Me 3访问一个膦亚胺取代的硼烷家族(2a–d,3b–d,4c,d和6a,b)消除SiX(X = Cl,F)。介绍了控制单体或二聚体产物(7c,d)形成的空间和电子因素。另外,在某些情况下,观察到路易斯酸介导的硅键合的甲基交换为氯取代基(5a,b)。基于膦亚胺取代的硼烷,在与MeOTf反应后制备了一系列的硼离子盐(8b–d,9c,10b–d)。所有化合物均已得到充分表征,并通过X射线衍射确定了许多分子结构。
Amido complexes of vanadium for olefin polymerization
申请人:Arndt-Rosenau Michael
公开号:US20050282982A1
公开(公告)日:2005-12-22
The present invention relates to compounds containing vanadium in the oxidation state +III or +IV and one or more amido groups, a process for preparing these compounds, the use of the compounds of the invention for preparing a catalyst composition, a process for preparing the catalyst composition and also a process for preparing homopolymers and/or copolymers using the catalyst composition.
An Approach to Catalyst Design: Cyclopentadienyl-Titanium Phosphinimide Complexes in Ethylene Polymerization
作者:Douglas W. Stephan、Jeffrey C. Stewart、Frédéric Guérin、Silke Courtenay、James Kickham、Emily Hollink、Chad Beddie、Aaron Hoskin、Todd Graham、Pingrong Wei、Rupert E. v. H. Spence、Wei Xu、Linda Koch、Xiaoliang Gao、Daryll G. Harrison
DOI:10.1021/om020954t
日期:2003.4.1
for polymerization catalyst design has been developed based on the steric and electronic analogy of bulky phosphinimides to cyclopentadienyl ligands. To this end, the family of complexes of the form (Cp†)TiCl2(NPR3) has been prepared and characterized. Alkyl and aryl derivatives of these species have also been synthesized, and a number have been evaluated for use as catalyst precursors in olefin polymerization