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Investigations into the recovery of Wilkinson’s catalyst with silica-immobilised P-donor ligands

Authors
Journal
Reactive and Functional Polymers
1381-5148
Publisher
Elsevier
Publication Date
Volume
57
Issue
1
Identifiers
DOI: 10.1016/j.reactfunctpolym.2003.06.001
Keywords
  • Ion Exchange
  • Rhodium Ions
  • Phosphorus Ligands
  • Silica
  • Poly Glycidylmethacrylate

Abstract

Abstract Three PPh 2 functionalities, immobilised through a C2 ( 1), C3 ( 2), and C5 ( 3) spacer onto silica, have been studied for their capacity to recover Wilkinson’s catalyst. A low surface concentration of the ligand together with a short spacer arm gave the best recovery results, as under these conditions the formation of stable RhL 2 and Rh 2L 2 complexes is precluded. The silica immobilised phosphorus ligands are oxidised under the rhodium extraction conditions, dependent on the presence of rhodium ions and the silica backbone, while no oxidation occurs when using phosphorus ligands anchored on an organic backbone.

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