A novel method for preparation of imidazolium tetrafluoroborate ionic liquids

A new method for the preparation of substituted imidazolium tetrafluoroborate salt, some of which are known as versatile room temperature ionic liquids, is proposed. The new method based on N-methylation of imidazole provided tetrafluoroborate derivatives containing no counterions, with shorter time and lower cost than conventional ion-exchange method.