Solvent free synthesis of coumarins using environment friendly solid acid catalysts

Authors: Shrinivas Ghodke, Uma Chudasama

Abstract:
Solid acid catalysts, ZrPW (Zirconium(IV) Phosphotungstate) and 12-TPA/ZrO₂ [12-Tungstophosphoric acid (12-TPA) supported onto ZrO₂] have been synthesized. The catalysts have been characterized for chemical stability, elemental analysis by ICP-AES, TGA, FTIR, SEM, EDX, XRD, surface area (BET) and surface acidity (NH₃-TPD). The performance ofthese materials as solid acid catalysts has been explored by studying Pechmann condensation as a model reaction, wherein phenols have been treated with methyl acetoacetate to give coumarins, under solvent free conditions using conventional heating as well as microwave heating. Catalytic activity of both the solid acid catalysts have been compared and correlated with surface properties of the materials.

Keywords:
Solid acid catalyst
Zirconium(IV)
Phosphotungstate
12-TPA supported solid acid catalyst
Coumarin derivatives
Pechmann condensation
Microwave-assisted synthesis

Published in: Applied catalysis A: General  (Volume 453, Pages 1-402, 26 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Solvent free synthesis of coumarins using environment friendly solid acid catalysts

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