Rhodium catalysts bound to functionalized mesoporous silica

Thomas E. Bitterwolf, J. David Newell, Colin T. Carver, R. Shane Addleman, John C. Linehan, Glen Fryxell

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11 Citations (Scopus)

Abstract

Phosphine and amine functionalized mesoporous silica materials were metallated with Rh(CO)2(i-Pr2NH)Cl or Rh 2(CO)4Cl2, respectively, to yield catalysts containing the Rh(PPh2R)2(CO)Cl or Rh(CO) 2(NH2R)Cl, where R is a propyl chain bonded to the silica surface, reactive centers. In order to ascertain the effect of pore size on rates of hydroformylation catalysis both 35 and 45 Å pore size materials were used. Using the hydroformylation of octene as a reference reaction, the phosphine based, 45 Å catalysts were 1.5-1.3 times faster than the amine based, 45 Å catalysts, and the 45 Å materials were 2.6-2.1 times faster than the 35 Å materials. The orientation of the catalyst relative to the functionalized surface, and the steric environment around the catalyst active site appear to be significant in determining rate of reaction. The ability of the surface bound phosphine catalysts to affect hydroformylation was strongly influenced by the steric constraints of the substrate. Terminal alkenes were readily hydroformylated and norbornene was slowly hydroformylated, but pinene, trans-cyclododecene, cyclohexene and cholesterol were nonreactive to the catalytic center.

Original languageEnglish
Pages (from-to)3001-3006
Number of pages6
JournalInorganica Chimica Acta
Volume357
Issue number10
DOIs
Publication statusPublished - Jul 20 2004

Keywords

  • Hydroformylation
  • Mesoporous silica
  • Rhodium catalysis

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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  • Cite this

    Bitterwolf, T. E., David Newell, J., Carver, C. T., Shane Addleman, R., Linehan, J. C., & Fryxell, G. (2004). Rhodium catalysts bound to functionalized mesoporous silica. Inorganica Chimica Acta, 357(10), 3001-3006. https://doi.org/10.1016/j.ica.2004.05.038