Phosphosulfonic acid as an soild acid supported on nanosilica extracted from rice husk in Polyhydroqinilion Synthesis

Abstract

Phosphosulfonic acid as a multi solid site was easily prepared from the reaction of ammonium dihydrogen phosphate with chlorosulfonic acid in CCl₄and for improved its catalytic activity was supported nano Silica was extracted from husk rice contains about 95% of Silica the size of extracted nano silica was determined by SEM efficiency of this solid acid in four component condensation reaction of aromatic aldehydes, dimidone, diketon, an ammonium acetate was investigated the results were clearly shown that aldehydes having electron withdrawing and electron donating groups were efficiently converted to the corresponding Polyhydroqinilion the high yields and short time products were produced at 110 ⁰C under solvent free conditions.