Heterogeneous oxidation of pyrimidine and alkyl thioethers in ionic liquids over mesoporous Ti or Ti/Ge catalysts

V. Cimpeanu, V.I. Parvulescu, P Amoros, D Beltran, Jillian Thompson, C Hardacre*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

Heterogeneous catalytic oxidation of a series of thioethers (2-thiomethylpyrimidine, 2-thiomethyl-4,6-dimethyl-pyrimidine, 2-thiobenzylpyrimidine, 2-thiobenzyl-4,6-dimethylpyrimidine, thioanisole, and n-heptyl methyl sulfide) was performed in ionic liquids by using MCM-41 and UVM-type mesoporous catalysts containing Ti, or Ti and Ge. A range of triflate, tetrafluoroborate, trifluoroacetate, lactate and bis(trifluoromethanesulfonyl)imide-based ionic liquids were used. The oxidations were carried out by using anhydrous hydrogen peroxide or the urea-hydrogen peroxide adduct and showed that ionic liquids are very effective solvents, achieving greater reactivity and selectivity than reactions performed in dioxane. The effects of halide and acid impurities on the reactions were also investigated. Recycling experiments on catalysts were carried out in order to evaluate Ti leaching and its effect on activity and selectivity.

Original languageEnglish
Pages (from-to)4640-4646
Number of pages7
JournalChemistry - A European Journal
Volume10
Issue number18
DOIs
Publication statusPublished - 20 Sep 2004

Keywords

  • heterogeneous catalysis
  • SOLVENTS
  • thioether
  • SULFOXIDATION
  • HALIDE
  • CONTAINING ZEOLITES
  • 2-THIOBENZYL-4,6-DIMETHYL-PYRIMIDINE
  • HYDROGEN-PEROXIDE
  • WATER
  • sulfoxidation
  • OXIDES
  • ionic liquids
  • TITANIUM SILICALITE
  • mesoporous materials
  • COMPLEXES

Cite this