Multi-layered, covalently supported ionic liquid phase (mlc-SILP) as highly cross-linked support for recyclable palladium catalyst for the Suzuki reaction in aqueous medium

Renato Noto, Francesco Giacalone, Anna Maria Pia Salvo, Michelangelo Gruttadauria, Paola Agrigento, Paolo P. Pescarmona, Johan A. Martens, Leonarda F. Liotta, Carmela Aprile

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Abstract

Reaction between an excess of 1,4-bis-(3-vinylimidazolium-1-yl) bromide and a mercaptopropyl-modified amorphous silica gel or ordered mesoporous silica SBA-15 in the presence of azobisisobutyronitrile (AIBN) afforded new materials, which have a high imidazolium moiety loading. These materials, which contain a highly cross-linked polymeric network, have been denoted as multi layered covalently supported ionic liquid phase (mlc-SILP) and have been used as support for palladium catalysts containing a high loading of the metal (10 wt%). Such materials were characterized by several techniques (13C Magic Angle Spinning Nuclear Magnetic Resonance, Brunauer-Emmett-Teller technique, small-angle X-ray scattering, X-ray diffraction, X-ray photoelectron spectroscopy, Transmission Electron Microscopy). The presence of a homogeneous distribution of palladium nanoparticles was established. The palladium catalysts displayed good activity allowing the synthesis of several biphenyl compounds in high yields working with only 0.1 mol% of palladium loading at mild temperature (r.t. or 50°C) in ethanol/water. Reactions carried out on 10 mmol scale required only 10 mg of catalysts. Good recyclability was observed.
Lingua originaleEnglish
pagine (da-a)2119-2130
Numero di pagine12
RivistaADVANCED SYNTHESIS & CATALYSIS
Volume353
Stato di pubblicazionePublished - 2011

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All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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