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Citation: WANG Kai, ZHANG Dai-Jun, WANG Peng, LIN Sen, ZHOU Jin, SUN Hong-Jian. Application of Ionic Liquids in Wacker Reaction[J]. Chinese Journal of Applied Chemistry, ;2007, 24(4): 392-395. shu

Application of Ionic Liquids in Wacker Reaction

1.
School of Chemistry and Chemical Engineering, Shandong University, Ji'nan 250100

Corresponding author: SUN Hong-Jian,
Received Date: 9 June 2006
Available Online: 25 August 2006
Fund Project: 国家自然科学基金(20372042) (20372042)

This paper reports the preparation of three alkyl imidazalium ionic liquids,1butyl-3-methylimidazolium chloride(bmimCl),1-butyl-3-methylimidazolium tetrafluoroborate(bmimBF₄) and 1-butyl-3-methylimidazolium hexafluorophosphate(bmimPF₆).At 60℃ and under 2 MPa,the Wacker reaction of 1-heptene oxidized with molecular oxygen to 2-heptanone with PdCl₂-CuCl₂ as the catalyst was studied in different reaction media,bmimPF₆,acidic aqueous solution and solvent-free.It shows that 2-heptanone is formed in all of the above three cases and the conversions can reach 90% after a reaction time of 6 h.However,the selectivity in bmimPF₆ for 2-heptanone is much higher than those in acidic aqueous solution and in heptene(solvent-free).In order to study the stability of the catalyst,the experiments were repeated in acidic aqueous solution and in bmimPF₆ solvent.The results show that the palladium chloride catalyst is more stable in bmimPF₆.It indicates that ionic liquids can be used as an alternative for the traditional,toxic,volatile organic solvents for Wacker reaction.
- ionic liquid,
- Wacker reaction,
- heptene,
- heptanone,
- palladium
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