Transition metal complex, process for producing the same, olefin polymerization catalyst containing the transition metal complex and process for producing olefin polymers
申请人:Sumitmo Chemical Company, Limited
公开号:US06329478B1
公开(公告)日:2001-12-11
The present invention relates to a transition metal complex, a process for producing the same, a polymerization catalsyt containing the transition metal complex and a process for producing polymers which uses the catalysts.
Yttrium Phosphasalen Initiators for <i>rac</i>-Lactide Polymerization
作者:Clare Bakewell、Thi-Phuong-Anh Cao、Xavier F. Le Goff、Nicholas J. Long、Audrey Auffrant、Charlotte K. Williams
DOI:10.1021/om301129k
日期:2013.3.11
A series of highly active yttrium phosphasalen initiators for the heteroselectivering-openingpolymerization of rac-lactide are reported. The initiators are yttrium alkoxide complexes ligated by iminophosphorane analogues of the popular “salen” ligand, termed “phosphasalens”. A series of novel phosphasalens have been synthesized, with varying substituents on the phenoxide rings and ethylene, propylene
Yttrium Phosphasalen Initiators for <i>rac</i>-Lactide Polymerization: Excellent Rates and High Iso-Selectivities
作者:Clare Bakewell、Thi-Phuong-Anh Cao、Nicholas Long、Xavier F. Le Goff、Audrey Auffrant、Charlotte K. Williams
DOI:10.1021/ja310003v
日期:2012.12.26
Highlyactiveyttrium phosphasalen initiators for the stereocontrolled ring-opening polymerization of rac-lactide are reported. The initiators are coordinated by a new class of ancillary ligand: an iminophosphorane derivative of the popular "salen" ligand, termed "phosphasalen". Changing the phosphasalen structure enables access to high iso-selectivities (P(i) = 0.84) or hetero-selectivities (P(s)