A remarkable inversion of structure-activity dependence on imido N-substituents with varying co-ligand topology and the synthesis of a new borate-free zwitterionic polymerisation catalyst

Ethylene polymerisation productivities of tris(pyrazolyl)methane-supported catalysts [Ti(NR){HC(Me2pz)3}Cl2] show a dramatically different dependence on the imido R-group compared to those of their TACN analogues, attributed to differences in fac-N3 donor topology; when treated with AliBu3, the zwit...

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Published in:Chemical communications (Cambridge, England) England), 2006-01 (4), p.436-438
Main Authors: Bigmore, Helen R, Dubberley, Stuart R, Kranenburg, Mirko, Lawrence, Sally C, Sealey, Andrew J, Selby, Jonathan D, Zuideveld, Martin A, Cowley, Andrew R, Mountford, Philip
Format: Article
Language:English
Subjects:
Aza Compounds - chemical synthesis
Borates - chemistry
Catalysis
Imides - chemistry
Ligands
Molecular Structure
Organometallic Compounds - chemical synthesis
Polymers - chemistry
Pyrazoles - chemical synthesis
Titanium - chemistry
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Summary:Ethylene polymerisation productivities of tris(pyrazolyl)methane-supported catalysts [Ti(NR){HC(Me2pz)3}Cl2] show a dramatically different dependence on the imido R-group compared to those of their TACN analogues, attributed to differences in fac-N3 donor topology; when treated with AliBu3, the zwitterionic tris(pyrazolyl)methide compound [Ti(N-2-C6H4tBu){C(Me2pz)3}Cl(THF)] also acts as a highly active, single site catalyst (TACN = 1,4,7-trimethyltriazacyclononane).
ISSN:1359-7345
1364-548X
DOI:10.1039/b514467a