Abstract
Incipient wetness impregnation method was used for the immobilization of
heteropolyacid 12- phosphomolybdic acid H3[PMo12O40] (PMA) over
natural bentonite. The characterization techniques such as XRD, FT-IR,
FeSEM and EDS were used for characterization of catalyst. The catalytic
activity of three catalysts 10%, 20 % and 30 % PMA/bent studied for
the synthesis of 3,4-dihydropyrimidin-2(1H)-ones. The catalyst 30 %
PMA/bent displayed high activity towards the synthesis of a variety of
dihydropyrimidones (DHPMs). The high yield of dihydropyrimidone (DHPM)
was obtained in model reaction in ethanol, acetonitrile and solvent -
free condition. The reusability test indicated that 4 % of yield of
product decreased after 5th cycle.