Proximity Effect using a Nanocage Structure: Polyhedral Oligomeric Silsesquioxane-Imidazolium Tetrachloro- palladate Salt as a Precatalyst for the Suzuki-Miyaura Reaction in Water

Lucia Anna Bivona, Francesco Giacalone, Esther Carbonell Llopis, Michelangelo Gruttadauria, Carmela Aprile

Research output: Contribution to journalArticlepeer-review

Abstract

A polyhedral oligomeric silsesquioxane-imidazolium tetrachloropalladate salt (POSS-Imi-PdCl4) was prepared by the reaction of a polyhedral oligomeric silsesquioxane-imidazolium chloride salt (POSS-Imi-Cl) with PdCl2 and used as a pre-catalyst for the Suzuki-Miyaura reaction in water at 100 °C at a low loading (0.08-0.16 mol %). Biphenyl compounds were isolated in high to excellent yields. A comparison of the POSS-based catalyst with the corresponding catalyst without the nanocage structure (i.e., 1-butyl-3-methylimidazolium tetrachloropalladate) highlighted the role of the POSS structure to reach higher yields in the Suzuki-Miyaura reaction. This result is ascribed to a proximity effect of the imidazolium moieties linked to the nanocage structure. Fresh and used catalytic materials were characterised by using X-ray photoelectron spectroscopy and TEM.

Original languageEnglish
Pages (from-to)1685-1691
Number of pages7
JournalChemCatChem
Volume8
Issue number9
DOIs
Publication statusPublished - 9 May 2016

Keywords

  • C-C coupling
  • cage compounds
  • palladium
  • phase-transfer catalysis
  • supported catalysts

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