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Amphiphilic Mesoporous Poly(Ionic Liquid) Immobilized Heteropolyanions Towards the Efficient Heterogeneous Epoxidation of Alkenes with Stoichiometric Hydrogen Peroxide
Author(s) -
Shi Yuming,
Guo Zengjing,
Wang Qian,
Zhang Lingyu,
Li Jing,
Zhou Yu,
Wang Jun
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201700906
Subject(s) - ionic liquid , hydrogen peroxide , catalysis , mesoporous material , chemistry , phosphotungstic acid , alkyl , heterogeneous catalysis , turnover number , amphiphile , inorganic chemistry , stoichiometry , polymerization , polymer chemistry , organic chemistry , copolymer , polymer
New mesoporous poly(ionic liquid)s (MPILs) that feature a pure polycationic framework and tunable hydrophobicity were synthesized through the free‐radical polymerization of alkyl‐functionalized ionic liquids (ILs) and bisvinylimidazolium salt. Phosphotungstic (PW) anions were immobilized firmly on these MPILs with a high dispersion and density. The obtained catalyst was effective in the epoxidation of cis ‐cyclooctene with stoichiometric hydrogen peroxide (H 2 O 2 ) to give a high yield (>98 %) and a remarkable H 2 O 2 efficiency (>98 %). The maximum turnover number and turnover frequency was 2375 and 685 h −1 , respectively. The catalyst can be recovered easily by filtration and reused with stable activity. Other alkenes can be converted with high yields. The extraordinary performance was attributed to the pure ionic porous framework with an enhanced hydrophobicity that not only provides strong cation–anion interactions towards the stable immobilized PW anions with a high dispersion but also enables the strong affinity of the catalyst with both the substrate and oxidant.