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Notable Effects of Aluminum Alkyls and Solvents for Highly Efficient Ethylene (Co)polymerizations Catalyzed by (Arylimido)‐ (aryloxo)vanadium Complexes
Author(s) -
Wang Wei,
Nomura Kotohiro
Publication year - 2006
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200505446
Subject(s) - chemistry , catalysis , toluene , ethylene , norbornene , vanadium , alkyl , solvent , aryl , polymerization , ligand (biochemistry) , polymer chemistry , medicinal chemistry , epoxide , organic chemistry , polymer , biochemistry , receptor
The effects of both Al cocatalyst and solvent on catalytic activity in the ethylene polymerization by the (arylmido)(aryloxo)vanadium(V) complex, VCl 2 (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 kg PE/mol V⋅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 VCl 2 (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 )].