Highly isoselective coordination polymerization of ortho-methoxystyrene with ß-diketiminato rare-earth-metal precursors.
Angew Chem Int Ed Engl
; 54(17): 5205-9, 2015 Apr 20.
Article
em En
| MEDLINE
| ID: mdl-25728133
ABSTRACT
Stereoselective coordination/insertion polymerization of the polar ortho-methoxystyrene has been achieved for the first time by using the cationic ß-diketiminato rare-earth-metal species. High activity and excellent isoselectivity (mmmm>99 %) were acheived. The unmasked Lewis-basic methoxy group does not poison the Lewis-acidic metal center, but instead activates the polymerization through σ-π chelation to the active species together with the vinyl group, thus lower the coordination and activation energies as compared with those of styrene derivatives lacking the methoxy group.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2015
Tipo de documento:
Article