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Syndio‐ and Isoselective Coordinative Chain Transfer Polymerization of Styrene Promoted by ansa ‐Lanthanidocene/ Dialkylmagnesium Systems
Author(s) -
Sarazin Yann,
de Frémont Pierre,
Annunziata Liana,
Duc Michel,
Carpentier JeanFrançois
Publication year - 2011
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.201100059
Subject(s) - chemistry , styrene , polymerization , polymer chemistry , chain transfer , magnesium , polymer , catalysis , copolymer , organic chemistry , radical polymerization
Combinations of the discrete neutral allyl ansa ‐lanthanidocenes {Me 2 C(Cp)(Flu)}Nd[1,3‐ (SiMe 3 ) 2 C 3 H 3 ] and rac ‐{Me 2 C(Ind) 2 }Y[1,3‐ (SiMe 3 ) 2 C 3 H 3 ] with di( n ‐butyl)magnesium constitute efficient binary catalytic systems for the stereocontrolled coordinative chain transfer polymerization of styrene, yielding near‐perfect syndio‐ and iso specific polystyrenes, respectively, with high activities and productivities. By adjusting the amount of di( n ‐butyl)magnesium, up to 200 polymer chains can be generated per lanthabide center, and good control of the molecular weight features enables the tailoring of low to medium molecular weight polymers.