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 |
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| 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 |
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| Institution: | Chemistry Research Laboratory, University of Oxford, Mansifeld Road, Oxford, UK OX1 3TA. |
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| 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). |
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