CO-ethylene copolymerization reactions in different reaction media catalyzed by palladium(II) complexes with chelating diphosphines bearing ortho-methoxy-substituted aryl groups

Claudio Bianchini, Andrea Meli, Werner Oberhauser, Anna M. Segarra, Carmen Claver, Eduardo J. Garcia-Suarez

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Neutral and bis-cationic palladium(H) complexes with 1,2-bis(di(2-methoxyphenyl)phosphino)ethane (o-MeO-dppe) and 1,3-bis(di(2-methoxyphenyl)phosphino)propane (o-MeO-dppp) have been synthesized and employed to catalyze the CO-ethylene copolymerization reaction in either protic or aprotic solvents. A comparison of the catalytic performance of these complexes with that of analogous precursors stabilized by 1,2-bis(diphenylphosphino)ethane (dppe) and 1,3-bis(diphenylphosphino)propane (dppp) ligands has shown significant differences in terms of catalytic productivity and molecular weight. In situ and operando high-pressure NMR experiments have provided valuable information on catalysis resting states and intermediates and have contributed to rationalize the observed productivity as well. (c) 2006 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalJournal of Molecular Catalysis A: Chemical
Volume265
Issue number1-2
Pages (from-to)292-305
ISSN1381-1169
DOIs
Publication statusPublished - 2007
Externally publishedYes

Keywords

  • Catalyst activity
  • Chelation
  • Copolymerization
  • Molecular weight
  • Nuclear magnetic resonance spectroscopy
  • Palladium
  • Reaction kinetics
  • Substitution reactions
  • Cobalt compounds
  • Aprotic solvents
  • Aryl groups
  • Catalytic performances
  • Chelating diphosphines
  • 1,2-Bis(di(2-methoxyphenyl)phosphino)ethane
  • 1,3-Bis(di(2-methoxyphenyl)phosphino)propane
  • 2,2,2-Trifluoroethanol
  • L
  • X
  • CHEMISTRY,
  • LOW-MOLECULAR-WEIGHT
  • CARBON-MONOXIDE
  • ALTERNATING COPOLYMERIZATION
  • ETHENE
  • LIGANDS
  • NICKEL(II)
  • POLYKETONE
  • INSERTION
  • HYDROGEN
  • CRYSTAL
  • copolymerization
  • palladium
  • 1,2-bis(di(2-methoxyphenyl)phosphino)ethane
  • 1,3-bis(di(2-methoxyphenyl)phosphino)propane
  • 2,2,2-trifluoroethanol

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