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Efficient recyclable catalytic system for deoxygenation of sulfoxides: Catalysis of ionic liquid-molybdenum complexes in ionic liquid solution

Bagherzadeh, M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1039/c2nj21001k
  3. Publisher: 2012
  4. Abstract:
  5. Three newly synthesized room temperature ionic liquids containing molybdate anion, [DMIm][MoO 2(NCS) 4], [RPy][MoO 2(NCS) 4] (R = butyl or decyl), and previously reported [BMIm][MoO 2(NCS) 4] were used as catalysts for the reduction of sulfoxides. For facilitating the recyclability of the catalysts, the ionic liquids [RMIm][PF 6] and [RPy][PF 6] (RMIm = 1-n-alkyl-3-methylimidazolium, RPy = 1-n-alkylpyridinium) were applied as ionic solvents and toluene is used as solvent for the organic phase. Molybdenum salts immobilized in RTILs constituted a reusable and efficient heterogeneous catalyst system. A maximum conversion (>99%) was achieved for reduction of diphenyl sulfoxide to diphenyl sulfide as a model substrate by using triphenylphosphine as reducing agent at 50 °C after 20 h. This system gave the best results in terms of catalyst/solvent recycling and no loss of catalytic activity was observed after 8 cycles
  6. Keywords:
  7. Imidazole derivative ; Ionic liquid ; Molybdenum complex ; Pyridinium derivative ; Sulfide ; Sulfoxide ; Toluene ; Triphenylphosphine ; Catalysis ; Deoxygenation ; Priority journal ; Recycling ; Reduction
  8. Source: New Journal of Chemistry ; Volume 36, Issue 4 , Dec , 2012 , Pages 971-976 ; 11440546 (ISSN)
  9. URL: http://pubs.rsc.org/en/Content/ArticleLanding/2012/NJ/c2nj21001k