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Polymerization of Methyl Methacrylate with Homogeneous Organopalladium/MMAO Systems
Author(s) -
Ihara Eiji,
Maeno Yohei,
Yasuda Hajime
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010601)202:9<1518::aid-macp1518>3.0.co;2-e
Subject(s) - organopalladium , isoprene , polymer chemistry , polymerization , polymer , styrene , chemistry , homogeneous , ethylene , methyl methacrylate , alkyl , copolymer , organic chemistry , palladium , catalysis , physics , thermodynamics
A series of Cp′Pd(η 3 ‐C 3 H 5 )/MMAO systems was found to proceed in the syndio‐rich polymerization of methyl methacrylate in high yield, while these initiators were completely inert for polymerizations of styrene, ethylene, and isoprene. Among these complexes trimethylsilylated complexes such as (Me 3 SiC 5 H 4 )Pd(η 3 ‐C 3 H 5 ) 4 and [1,3‐(Me 3 Si) 2 C 5 H 3 ]Pd(η 3 ‐C 3 H 5 ) 5 coupled with MMAO operate the polymerization to result in polymers with narrow molecular weight distributions and high syndiotacticities. In sharp contrast to these systems, alkyl substituted complexes like (tBuC 5 H 4 )Pd(η 3 ‐C 3 H 5 ) and (tBu 2 C 5 H 3 )Pd(η 3 ‐C 3 H 5 ) produced the polymers in poor yields with low syndiotacticities.