Z. Dai
2007
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Journal
Chinese Journal of Applied Chemistry
Abstract
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.