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

Helen R Bigmore; Stuart R Dubberley; Mirko Kranenburg; Sally C Lawrence; Andrew J Sealey; Jonathan D Selby; Martin A Zuideveld; Andrew R Cowley; Philip Mountford

doi:10.1039/b514467a

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

Chem Commun (Camb). 2006 Jan 28:(4):436-8. doi: 10.1039/b514467a.

Authors

Helen R Bigmore¹, Stuart R Dubberley, Mirko Kranenburg, Sally C Lawrence, Andrew J Sealey, Jonathan D Selby, Martin A Zuideveld, Andrew R Cowley, Philip Mountford

Affiliation

¹ Chemistry Research Laboratory, University of Oxford, Mansifeld Road, Oxford, UK OX1 3TA.

PMID: 16493828
DOI: 10.1039/b514467a

Abstract

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).

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Aza Compounds / chemical synthesis*
Borates / chemistry
Catalysis
Imides / chemistry*
Ligands
Molecular Structure
Organometallic Compounds / chemical synthesis*
Polymers / chemistry
Pyrazoles / chemical synthesis*
Titanium / chemistry*

Substances

1,4,7-trimethyl-1,4,7-triazacyclononane
Aza Compounds
Borates
Imides
Ligands
Organometallic Compounds
Polymers
Pyrazoles
tris(pyrazolyl)methane
Titanium