Abstract
Preparation of N-(3-silicapropyl) imidazolium hydrogen sulfate ([Sipim]HSO4) as a heterogeneous acidic ionic liquid is described. This heterogeneous ionic liquid was used as catalyst for the synthesis of α-aminonitriles by a one-pot condensation of aldehydes, amines, and trimethylsilyl cyanide at room temperature. Catalyst could be recycled for several times without any additional treatment. A simple and efficient procedure for the preparation of silica-based acidic ionic liquid ([Sipim]HSO4) is described. This heterogeneous solid acid is employed as a catalyst for the synthesis of a-amino nitriles at room temperature.
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