Tetrahedron

Bimetallic samarium (III) catalysts via electron transfer initiation: The facile synthesis of well-defined (meth) acrylate triblock copolymers

LS Boffa, BM Novak

Index: Boffa, Lisa S.; Novak, Bruce M. Tetrahedron, 1997 , vol. 53, # 45 p. 15367 - 15396

Full Text: HTML

Citation Number: 32

Abstract

A method for generating a bifunctional organolanthanide (III) initiator in situ from a (meth) acrylate monomer and a divalent samarium precursor,(C5Me5) 2Sm (1) or (C5Me5) 2Sm (THF) 2 (2), is described. This process involves one-electron transfer from the Sm (II) species to monomer, forming radical anions which couple to give a bimetallic samarium (III) enolate that acts as a bisinitiator for living polymerization. Well-defined, highly syndiotactic ABA ...