Abstract
The effects of both Al cocatalyst and solvent on catalytic activity in the ethylene polymerization by the (arylmido)(aryloxo)vanadium(V) complex, VCl2(N-2,6-Me 2 C 6 H 3 )(O-2,6-Me 2 C 6 H 3 ) (1), have been explored in detail. The activity of 5.84 × 10 5 kgPE/molV-h (TOF 2.08 × 10 7 h -1 ) has been achieved by 1/EtAlCl 2 catalyst in CH 2 Cl 2 at 0°C, and the activity in toluene increased in the order: i-Bu 2 AlCl > EtAlCl 2 > Me 2 AlCl > Et 2 AlCl > Et 2 Al(OEt), AlEt 3 , AlMe 3 (negligible activities). Both aluminum alkyl cocatalyst and solvent also affected the catalytic activity and the norbornene (NBE) incorporation in the ethylene/NBE copolymerization using complex 1, whereas the NBE contents were not strongly affected by the kind of aryl oxide ligand in VCl2(N-2,6-Me 2 C 6 H 3 )(OAr) [OAr=O-2,6-Me 2 C 6 H 3 (1), O-2,6-i-Pr 2 C 6 H 3 (2), O-2,6-Ph 2 C 6 H 3 (3)].
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