Journal
CATALYSIS LETTERS
Volume 143, Issue 2, Pages 193-199Publisher
SPRINGER
DOI: 10.1007/s10562-012-0939-5
Keywords
Ionic liquid; Beckmann rearrangement; Cyclohexanone oxime; Caprolactam; Phosphotungstate
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The heteropolyanion-based ionic liquid (IL) material [MIMPS](3)PW12O40, propane sulfoacid-functionalized imidazolium salt of phosphotungstate, was used as a solid catalyst for liquid-phase Beckmann rearrangements of ketoximes in the presence of zinc chloride. The resultant liquid-solid biphasic rearrangement reaction of cyclohexanone oxime shows a high yield 83 % with good recyclability. The testing of control catalysts, reaction conditions, oxime substrates, and recycling property were carried out and the results are discussed.
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