SBA-15/ HCs2Mo6W6O40: as Efficient and Re-Usable Catalyst for the synthesis of 4HPyrano[2,3-c]pyrazoles

Cesium salt of tungsten-substituted molybdophosphoric acid, Cs2H [PMo6W6O40], supported onplatelet SBA-15 was synthesized. The structural properties of as-prepared catalysts were characterized using variousanalytical techniques; Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy,transition electron microscopy and nitrogen adsorption desorption. The results showed that Cs salts of HPA were highlydispersed on mesoporous silica surface. The synthesized material was employed as an efficient and recyclable catalystfor the synthesis of 4H-Pyrano[2,3-c]pyrazoles via one-pot three-component condensation of aromatic aldehyde andmalononitrile with 3-methyl-1-phenyl-2-pyrazolin-5-ones.

Keywords:

SBA-15 , Hetropoly acid , 4H-Pyrano[2 , 3-c]pyrazoles