Owing to their unique chemical and physical properties

ionic liquids have caught attention for applications in diverse areas ranging from synthetic and catalytic chemistry to biotechnology

electrochemistry and material science. For fully using it in reaction

understanding of the physical and chemical properties of the ionic liquids is very important.The ionic liquid 1-butyl-3-methyl imidazolium tetraphenylborate (［BMIm］［BPh4］) was synthesized in this study.Its structure and stability were determined by 1H NMR，UV and DSC. The melting point，solubilities and conductivities in different solvents and under different conditions were studied as well.The results showed that 1-butyl-3-methyl imidazolium tetraphenylborate was stable and was characterized as a strong electrolyte. The limiting molar conductivity values of the compound in acetone

acetonitrile

DMF

ethanol and ethyl acetate were 157.53

171.38

58.87

42.04 and 15.02 S8226;cm28226;mol-1

respectively.［BMIm］［BPh4］ had definite catalytic activity in the synthesis of isopentyl acetate.