1,3-Disulfonic acid imidazolium hydrogen sulfate as an efficient and reusable ionic liquid catalyst for the N-Boc protection of amines

► Introduction of an efficient catalyst of [Dsim]X derivatives for organic transformations ► Introduction of an efficient and new method for the N-Boc protection of amines ► Generality of the method, high yields and solvent-free conditions ► Recovering and reusing of the ionic liquid catalyst