Abstract
A simple and efficient procedure for the preparation of silica-bonded N-propyl sulfamic acid ( SBNPSA) by the reaction of 3-aminopropylsilica ( 1) and chlorosulfonic acid in chloroform is described. This solid acid is employed as a new catalyst for the formylation of alcohols and amines with ethyl formate under mild and heterogeneous conditions at room temperature with good to excellent yields. Also, SBNPSA catalyzed acetylation of various alcohols and amines with acetic anhydride at room temperature.
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