SILICA-GEL SUPPORTED SULFAMIC ACID (SA/SiO2) AS AN EFFICIENT AND REUSABLE CATALYST FOR CONVERSION OF KETONES INTO OXATHIOACETALS AND DITHIOACETALS

A simple and efficient method for the conversion of carbonyl compounds to oxathioacetals and dithioacetals using SA/SiO2 as an acid catalyst has been achieved. SA/SiO2 is easily recovered from the reaction mixture and can be reused at least 15 times without loss of catalytic activity.