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

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.