Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 46, Issue 20, Pages 6819-6827Publisher
WILEY
DOI: 10.1002/pola.22990
Keywords
catalysts; chelate ligand; iron complex; living radical polymerization; transition metal chemistry
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Iron catalysts were evolved for more active transition metal-catalyzed living radical polymerization through design of the ligands. In situ introduction of P-N chelate-ligands, consisting of hetero-coordinating atoms [phosphine (P) and nitrogene (N)], onto FeBr2 effectively catalyzed living radical polymerization of methyl methacrylate (MMA) in conjunction with a bromide initiator, where the monomer-conversion reached over 90% without dropping the rates and the molecular weights of obtained PMMAs were well controlled. The benign effects of the hetero-chelation were demonstrated by comparative experiments with homo-chelate ligands (P-P, N-N), model compounds of the composed coordination site, and the combinations. We successfully achieved an isolation of iron complex with a P-N ligand [FeBr2(DMD]PE); DMDPE: (R)-N,N-dimethyl-1-(2-(diphenylphosphino)phenyl)-ethanamine], which was superior to the conventional catalyst [FeBr2(Pn-Bu)(2)] with respect to controllability and activity, especially at the latter stage. The catalyst was almost quantitatively removed by water washing after polymerization. It was also effective for living polymerization of styrene. (c) 2008 Wiley Periodicals, Inc.
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