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(Me(2)pz)(3)}Cl-2] show a dramatically different dependence on the imido R-group compared to those of their TACN analogues, attributed to differences in fac-N-3 donor topology; when treated with (AlBu3)-Bu...

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Published inChemical communications (Cambridge, England) no. 4; pp. 436 - 438
Main Authors Bigmore, HR, Dubberley, Kranenburg, M, Lawrence, SC, Sealey, AJ, Selby, JD, Zuideveld, MA, Cowley, AR, Mountford, P
Format Journal Article
LanguageEnglish
Published CAMBRIDGE Royal Soc Chemistry 28.01.2006
Subjects
Aza Compounds - chemical synthesis
Borates - chemistry
Catalysis
Chemistry
Chemistry, Multidisciplinary
Imides - chemistry
Ligands
Molecular Structure
Organometallic Compounds - chemical synthesis
Physical Sciences
Polymers - chemistry
Pyrazoles - chemical synthesis
Science & Technology
Titanium - chemistry
CARBANION
ACTIVATION
COMPLEXES
OLEFIN POLYMERIZATION
REACTIVITY
ETHYLENE POLYMERIZATION
TRIS(PYRAZOLYL)BORATE ZIRCONIUM
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Summary:Ethylene polymerisation productivities of tris(pyrazolyl)methane-supported catalysts [Ti(NR){HC(Me(2)pz)(3)}Cl-2] show a dramatically different dependence on the imido R-group compared to those of their TACN analogues, attributed to differences in fac-N-3 donor topology; when treated with (AlBu3)-Bu-i, the zwitterionic tris(pyrazolyl)methide compound [Ti(N-2-(C6H4Bu)-Bu-t){C(Me(2)pz)(3)}Cl(TBF)] also acts as a highly active, single site catalyst (TACN = 1,4,7-trimethyltriazacyclononane).
ISSN:1359-7345
DOI:10.1039/b514467a