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Green route for selective gram‐scale oxidation of sulfides using tungstate/triazine‐based ionic liquid immobilized on magnetic nanoparticles as a phase‐transfer heterogeneous catalyst
Author(s) -
Hosseini Seyed Hassan,
Tavakolizadeh Maryam,
Zohreh Nasrin,
Soleyman Rouhollah
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3953
Subject(s) - chemistry , tungstate , catalysis , ionic liquid , selectivity , sulfide , inorganic chemistry , cyanuric chloride , triazine , ion exchange , nanoparticle , magnetic nanoparticles , sulfonium , magnetic separation , ion , chemical engineering , organic chemistry , salt (chemistry) , physics , quantum mechanics , engineering
Tungstate ions were successfully loaded onto triazine‐based ionic liquid‐functionalized magnetic nanoparticles through an anion exchange process. The use of triazine core for creating ionic liquid led to the immobilization of high amounts of WO 4 2− . The resulting catalyst showed high activity and selectivity in the oxidation of sulfides to sulfoxides with H 2 O 2 as a green oxidant at room temperature. In addition, due to the presence of ammonium groups in the catalyst structure, water dispersibility of the catalyst was increased. More important, the catalyst was magnetically recovered and reused for up to six runs without any marked decrease of activity and selectivity. Finally, easy gram‐scale oxidation of methylphenyl sulfide as well as fast separation of catalyst and product makes the protocol economical and industrially applicable.