Abstract
A multinuclear NMR spectroscopic study was performed to assess the nature of species responsible for living ethylene (E)–norbornene (N) copolymerization reaction using the fluorinated enolatoimine titanium complex [Ti(κ2-N,O-{2,6-F2C6H3N═C(Me)C(H)C(CF3)O})2Cl2] (1) activated with dry methylaluminoxane (d-MAO). The analysis involved (i) the catalytic system (1 with MAO); (ii) the species formed after simultaneous addition of 13C-enriched ethylene and norbornene and after further addition of 13C-enriched ethylene; and (iii) species formed during norbornene homopolymerization. The results supported the existence of noncovalent interactions of ortho-fluoroaryl substituents with the titanium center, which contribute to the living character of the copolymerization reaction.
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